ABCDEFGHIJKLMNOPQRSTUVWXYZ
r* (23)
 Data2: Aluminium
 Data2: Arsenic
 Data2: Bismuth
 Data2: Chromium
 Data2: Cobalt
 Data2: Gallium
 Data2: Germanium
 Data2: Indium
 Data2: Iron
 Data2: Manganese
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Nickel
 Data2: Scandium
 Data2: Silicon
 Data2: Tin
 Data2: Titanium
 Data2: Uranium
 Data2: Vanadium
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 
r1 (1)
 Equation: Graham's Law
 
r2 (1)
 Equation: Graham's Law
 
r3 (93)
 Data2: Actinium
 Data2: Aluminium
 Data2: Americium
 Data2: Antimony
 Data2: Arsenic
 Data2: Astatine
 Data2: Barium
 Data2: Berkelium
 Data2: Beryllium
 Data2: Bismuth
 Data2: Boron
 Data2: Bromine
 Data2: Cadmium
 Data2: Caesium
 Data2: Calcium
 Data2: Californium
 Data2: Carbon
 Data2: Cerium
 Data2: Chlorine
 Data2: Chromium
 Data2: Cobalt
 Data2: Copper
 Data2: Curium
 Data2: Dysprosium
 Data2: Erbium
 Data2: Europium
 Data2: Fluorine
 Data2: Francium
 Data2: Gadolinium
 Data2: Gallium
 Data2: Germanium
 Data2: Gold
 Data2: Hafnium
 Data2: Holmium
 Data2: Hydrogen
 Data2: Indium
 Data2: Iodine
 Data2: Iron
 Data2: Lanthanum
 Data2: Lawrencium
 Data2: Lead
 Data2: Lithium
 Data2: Lutetium
 Data2: Magnesium
 Data2: Manganese
 Data2: Mercury
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Neptunium
 Data2: Nickel
 Data2: Niobium
 Data2: Nitrogen
 Data2: Nobelium
 Data2: Osmium
 Data2: Oxygen
 Data2: Palladium
 Data2: Phosphorus
 Data2: Platinum
 Data2: Plutonium
 Data2: Polonium
 Data2: Potassium
 Data2: Praseodymium
 Data2: Promethium
 Data2: Protactinium
 Data2: Radium
 Data2: Rhenium
 Data2: Rhodium
 Data2: Rubidium
 Data2: Ruthenium
 Data2: Samarium
 Data2: Scandium
 Data2: Selenium
 Data2: Silicon
 Data2: Silver
 Data2: Sodium
 Data2: Sulfur
 Data2: Tantalum
 Data2: Technetium
 Data2: Tellurium
 Data2: Terbium
 Data2: Thallium
 Data2: Thorium
 Data2: Thulium
 Data2: Tin
 Data2: Titanium
 Data2: Tungsten
 Data2: Uranium
 Data2: Vanadium
 Data2: Xenon
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 
ra (10)
 Atomic data: Radium
 Data1: Radium
 Isotope: Actinium
 Isotope: Francium
 Isotope: Radium
 Isotope: Thorium
 Names: Sulfur
 Production: Actinium
 Reactions: Radium
 Spectrum: Radium
 
ra+ (1)
 Atomic data: Radium
 
ra+2 (1)
 Data2: Radium
 
ra2+ (1)
 Reactions: Radium
 
ra3n2 (1)
 Reactions: Radium
 
rabi (1)
 On This Day... 29 July
 
rabr2 (1)
 Compounds: Radium
 
race (1)
 Country: United States of America
 
racing (1)
 Data1: Magnesium
 
rackets (1)
 Data1: Boron
 
racl2 (1)
 Compounds: Radium
 
radar (1)
 Biography: Edwin Mattison McMillan
 
radars (1)
 Data1: Yttrium
 
radcliffe (1)
 Biography: Sir William Crookes
 
radiant (2)
 Biography: Sir William Crookes
 Glossary: Radiation
 
radiated (1)
 Biography: Robert Wilhelm Bunsen
 
radiating (1)
 Glossary: Alpha Decay
 
radiation (95)
 Allotrope: Oxygen
 Biography: Albert Ghiorso
 Biography: Edwin Mattison McMillan
 Biography: Emilio Gino Segre
 Biography: Gustav Robert Kirchhoff
 Biography: Irene Joliot-Curie
 Biography: Lise Meitner
 Biography: Pierre Curie
 Biography: Sir William Crookes
 Compounds: Aluminium
 Compounds: Cadmium
 Compounds: Calcium
 Compounds: Iodine
 Compounds: Lithium
 Compounds: Samarium
 Compounds: Sodium
 Compounds: Zinc
 Country: Canada
 Data1: Actinium
 Data1: Argon
 Data1: Caesium
 Data1: Californium
 Data1: Curium
 Data1: Fermium
 Data1: Krypton
 Data1: Lawrencium
 Data1: Lead
 Data1: Mendelevium
 Data1: Neodymium
 Data1: Neptunium
 Data1: Plutonium
 Data1: Promethium
 Data1: Radium
 Data1: Radon
 Data1: Seaborgium
 Data1: Technetium
 Data1: Thallium
 Data1: Thulium
 Data1: Vanadium
 Data1: Ytterbium
 Document: The Lanthanoid Series
 Glossary:
 Glossary: Absorption Spectrum
 Glossary: Air
 Glossary: Alpha Decay
 Glossary: Conduction
 Glossary: Convection
 Glossary: Electron Capture
 Glossary: Emission Spectrum
 Glossary: Gamma Ray
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 Glossary: Photon
 Glossary: Radiation
 Glossary: Radioactivity
 Glossary: X-Rays
 Isotope: Aluminium
 Isotope: Americium
 Isotope: Arsenic
 Isotope: Beryllium
 Isotope: Calcium
 Isotope: Chromium
 Isotope: Cobalt
 Isotope: Gadolinium
 Isotope: Krypton
 Isotope: Manganese
 Isotope: Molybdenum
 Isotope: Nickel
 Isotope: Niobium
 Isotope: Palladium
 Isotope: Rhodium
 Isotope: Rubidium
 Isotope: Ruthenium
 Isotope: Scandium
 Isotope: Selenium
 Isotope: Silver
 Isotope: Sodium
 Isotope: Strontium
 Isotope: Technetium
 Isotope: Thulium
 Isotope: Titanium
 Isotope: Ytterbium
 Isotope: Yttrium
 Isotope: Zinc
 Isotope: Zirconium
 On This Day... 15 December
 On This Day... 19 October
 On This Day... 20 February
 On This Day... 23 January
 On This Day... 25 May
 On This Day... 7 October
 Production: Mendelevium
 Production: Neptunium
 Production: Plutonium
 Production: Radon
 
radical (4)
 Biography: Antoine Alexandre Brutus Bussy
 Biography: Robert Wilhelm Bunsen
 Compounds: Nitrogen
 On This Day... 24 August
 
radically (1)
 Glossary: Allotrope
 
radicals (4)
 Compounds: Sodium
 Data1: Oxygen
 On This Day... 14 June
 On This Day... 20 May
 
radii (120)
 Data2: Actinium
 Data2: Aluminium
 Data2: Americium
 Data2: Antimony
 Data2: Argon
 Data2: Arsenic
 Data2: Astatine
 Data2: Barium
 Data2: Berkelium
 Data2: Beryllium
 Data2: Bismuth
 Data2: Bohrium
 Data2: Boron
 Data2: Bromine
 Data2: Cadmium
 Data2: Caesium
 Data2: Calcium
 Data2: Californium
 Data2: Carbon
 Data2: Cerium
 Data2: Chlorine
 Data2: Chromium
 Data2: Cobalt
 Data2: Copper
 Data2: Curium
 Data2: Darmstadtium
 Data2: Dubnium
 Data2: Dysprosium
 Data2: Einsteinium
 Data2: Erbium
 Data2: Europium
 Data2: Fermium
 Data2: Fluorine
 Data2: Francium
 Data2: Gadolinium
 Data2: Gallium
 Data2: Germanium
 Data2: Gold
 Data2: Hafnium
 Data2: Hassium
 Data2: Helium
 Data2: Holmium
 Data2: Hydrogen
 Data2: Indium
 Data2: Iodine
 Data2: Iridium
 Data2: Iron
 Data2: Krypton
 Data2: Lanthanum
 Data2: Lawrencium
 Data2: Lead
 Data2: Lithium
 Data2: Lutetium
 Data2: Magnesium
 Data2: Manganese
 Data2: Meitnerium
 Data2: Mendelevium
 Data2: Mercury
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Neon
 Data2: Neptunium
 Data2: Nickel
 Data2: Niobium
 Data2: Nitrogen
 Data2: Nobelium
 Data2: Osmium
 Data2: Oxygen
 Data2: Palladium
 Data2: Phosphorus
 Data2: Platinum
 Data2: Plutonium
 Data2: Polonium
 Data2: Potassium
 Data2: Praseodymium
 Data2: Promethium
 Data2: Protactinium
 Data2: Radium
 Data2: Radon
 Data2: Rhenium
 Data2: Rhodium
 Data2: Roentgenium
 Data2: Rubidium
 Data2: Ruthenium
 Data2: Rutherfordium
 Data2: Samarium
 Data2: Scandium
 Data2: Seaborgium
 Data2: Selenium
 Data2: Silicon
 Data2: Silver
 Data2: Sodium
 Data2: Strontium
 Data2: Sulfur
 Data2: Tantalum
 Data2: Technetium
 Data2: Tellurium
 Data2: Terbium
 Data2: Thallium
 Data2: Thorium
 Data2: Thulium
 Data2: Tin
 Data2: Titanium
 Data2: Tungsten
 Data2: Ununbium
 Data2: Ununhexium
 Data2: Ununoctium
 Data2: Ununpentium
 Data2: Ununquadium
 Data2: Ununseptium
 Data2: Ununtrium
 Data2: Uranium
 Data2: Vanadium
 Data2: Xenon
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 
radij (1)
 Names: Radium
 
radio (8)
 Biography: Albert Ghiorso
 Biography: Frederick Soddy
 Compounds: Beryllium
 Glossary: Radiation
 Isotope: Actinium
 Names: Radium
 On This Day... 11 November
 On This Day... 22 February
 
radioactive (94)
 Biography: Andre Louis Debierne
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Frederick Soddy
 Biography: Friedrich Ernst Dorn
 Biography: George Charles de Hevesy
 Biography: Lise Meitner
 Biography: Marie Curie (Marya Sklodowska)
 Biography: Pierre Curie
 Compounds: Actinium
 Compounds: Astatine
 Compounds: Berkelium
 Compounds: Californium
 Compounds: Curium
 Compounds: Einsteinium
 Compounds: Francium
 Compounds: Iodine
 Compounds: Neptunium
 Compounds: Polonium
 Compounds: Protactinium
 Country: Outer space
 Data1: Actinium
 Data1: Americium
 Data1: Argon
 Data1: Astatine
 Data1: Berkelium
 Data1: Bismuth
 Data1: Caesium
 Data1: Californium
 Data1: Carbon
 Data1: Curium
 Data1: Darmstadtium
 Data1: Einsteinium
 Data1: Fermium
 Data1: Francium
 Data1: Hafnium
 Data1: Helium
 Data1: Indium
 Data1: Iodine
 Data1: Mendelevium
 Data1: Neptunium
 Data1: Nobelium
 Data1: Plutonium
 Data1: Polonium
 Data1: Protactinium
 Data1: Radium
 Data1: Radon
 Data1: Roentgenium
 Data1: Technetium
 Data1: Tellurium
 Data1: Thorium
 Data1: Thulium
 Data1: Uranium
 Data1: Xenon
 Document: The Actinoid Series
 Document: The Alkali (Group 1) Metals
 Document: The Noble Gases (Group 18)
 Glossary: Actinides
 Glossary: Actinoids
 Glossary: Alpha Decay
 Glossary: Beta Particle
 Glossary: Cosmogenic isotope
 Glossary: Double Beta Decay
 Glossary: Electron Capture
 Glossary: Element
 Glossary: Gamma Ray
 Glossary: Isometric Transition
 Glossary: Magic Number
 Glossary: Spontaneous Fission
 Isotope: Astatine
 Isotope: Barium
 Isotope: Bismuth
 Isotope: Calcium
 Isotope: Carbon
 Isotope: Cobalt
 Isotope: Dubnium
 Isotope: Helium
 Isotope: Hydrogen
 Isotope: Iridium
 Isotope: Krypton
 Isotope: Phosphorus
 Isotope: Radium
 Isotope: Rutherfordium
 Isotope: Technetium
 Isotope: Tellurium
 Isotope: Uranium
 On This Day... 10 December
 On This Day... 24 October
 On This Day... 28 May
 On This Day... 30 August
 Production: Helium
 Production: Iridium
 Production: Ruthenium
 Production: Technetium
 Production: Thorium
 
radioactivity (28)
 Biography: Emilio Gino Segre
 Biography: Frederick Soddy
 Biography: Irene Joliot-Curie
 Biography: Lise Meitner
 Biography: Marie Curie (Marya Sklodowska)
 Biography: Pierre Curie
 Biography: Sir William Crookes
 Compounds: Radium
 Compounds: Thorium
 Data1: Actinium
 Data1: Bismuth
 Data1: Curium
 Data1: Indium
 Data1: Polonium
 Data1: Promethium
 Data1: Protactinium
 Data1: Radium
 Data1: Uranium
 Document: The Alkaline Earth Metals (Group 2)
 Glossary: Radiation
 Glossary: Radioactivity
 Isotope: Bismuth
 Isotope: Potassium
 On This Day... 1 March
 On This Day... 15 December
 Production: Technetium
 Reactions: Francium
 Reactions: Protactinium
 
radiocarbon (2)
 Isotope: Carbon
 On This Day... 4 March
 
radiochemical (1)
 Biography: Irene Joliot-Curie
 
radiochemist (3)
 Biography: Andre Louis Debierne
 Biography: Frederick Soddy
 On This Day... 2 September
 
radiocontrast (1)
 Data1: Gadolinium
 
radiogenic (1)
 Production: Bismuth
 
radiographers (1)
 Biography: Irene Joliot-Curie
 
radiography (3)
 Data1: Cobalt
 Isotope: Cobalt
 Isotope: Ytterbium
 
radioiodine (3)
 Compounds: Iodine
 Data1: Iodine
 Isotope: Iodine
 
radioisotope (5)
 Compounds: Samarium
 Glossary: Gamma Ray
 Isotope: Iridium
 Isotope: Strontium
 Production: Rhodium
 
radioisotopes (9)
 Data1: Americium
 Data1: Curium
 Data1: Einsteinium
 Data1: Mendelevium
 Data1: Neptunium
 Data1: Protactinium
 Glossary: Gamma Ray
 Glossary: Spontaneous Fission
 On This Day... 19 March
 
radiolabel (1)
 Isotope: Hydrogen
 
radiological (1)
 Data1: Radon
 
radiometer (1)
 Biography: Sir William Crookes
 
radiometric (1)
 Glossary: Spontaneous Fission
 
radionuclide (5)
 Compounds: Iodine
 Compounds: Technetium
 Country: Outer space
 Glossary: Abundance
 Isotope: Nickel
 
radionuclides (1)
 Compounds: Iodine
 
radiopharmaceutical (1)
 Isotope: Strontium
 
radiotherapy (3)
 Isotope: Cobalt
 Isotope: Iridium
 Isotope: Strontium
 
radium (35)
 Atomic data: Radium
 Biography: Andre Louis Debierne
 Biography: Frederick Soddy
 Biography: Friedrich Ernst Dorn
 Biography: Irene Joliot-Curie
 Biography: Marie Curie (Marya Sklodowska)
 Biography: Pierre Curie
 Biography: Sir William Ramsay
 Compounds: Radium
 Country: Australia
 Country: Canada
 Country: Czech Republic
 Country: Democratic Republic of Congo
 Country: United States of America
 Data1: Actinium
 Data1: Americium
 Data1: Curium
 Data1: Francium
 Data1: Polonium
 Data1: Radium
 Data1: Radon
 Data2: Radium
 Document: Chemical makeup of the human body
 Document: The Alkaline Earth Metals (Group 2)
 Isotope: Radium
 MAC data: Radium
 Names: Radium
 On This Day... 29 December
 On This Day... 7 May
 Production: Francium
 Production: Polonium
 Production: Radium
 Production: Radon
 Reactions: Radium
 Spectrum: Radium
 
radon (15)
 Atomic data: Radon
 Biography: Friedrich Ernst Dorn
 Compounds: Radon
 Data1: Radium
 Data1: Radon
 Data2: Radon
 Document: The Noble Gases (Group 18)
 Isotope: Radon
 MAC data: Radon
 Names: Radon
 On This Day... 27 July
 Production: Radon
 Reactions: Radon
 Reactions: Ununoctium
 Spectrum: Radon
 
raffinate (1)
 Production: Technetium
 
rahm (1)
 Data1: Tungsten
 
rail (1)
 Data1: Manganese
 
railroad (1)
 Biography: Ferdinand Frederic Henri Moissan
 
rain (3)
 Biography: Robert Wilhelm Bunsen
 Compounds: Sulfur
 On This Day... 4 July
 
rainbow (1)
 Data1: Iridium
 
rainbows (1)
 Data1: Iridium
 
rainer (1)
 On This Day... 14 January
 
rainwater (1)
 Isotope: Iodine
 
raise (2)
 Biography: Hans Christian Oersted
 Glossary: Specific heat
 
raised (2)
 Biography: Ida Eva Tacke Noddack
 Production: Tantalum
 
raises (1)
 Glossary: Convection
 
raising (2)
 Compounds: Phosphorus
 Glossary: Base
 
rajasthan (1)
 Data1: Zinc
 
ralph (2)
 Data1: Americium
 Data1: Curium
 
raman (1)
 On This Day... 7 November
 
rame (1)
 Names: Copper
 
ramsay (16)
 Biography: Frederick Soddy
 Biography: John William Strutt Rayleigh
 Biography: Morris Travers
 Biography: Otto Hahn
 Biography: Sir William Ramsay
 Data1: Argon
 Data1: Helium
 Data1: Krypton
 Data1: Neon
 Data1: Radon
 Data1: Xenon
 On This Day... 10 December
 On This Day... 12 July
 On This Day... 2 October
 On This Day... 23 March
 On This Day... 24 January
 
ramsey (3)
 Data1: Helium
 Data1: Krypton
 Data1: Xenon
 
ramsperger (1)
 On This Day... 21 July
 
ran (2)
 Country: Oceans / Seas
 Production: Gold
 
random (2)
 Glossary: Gas
 Glossary: Temperature
 
randomly (1)
 Isotope: Plutonium
 
ranelate (1)
 Compounds: Strontium
 
range (22)
 Allotrope: Carbon
 Biography: Robert Wilhelm Bunsen
 Compounds: Iron
 Compounds: Molybdenum
 Data1: Darmstadtium
 Data1: Rhenium
 Data1: Thallium
 Data1: Tungsten
 Equation: Acid dissociation constant
 Equation: Base ionisation constant
 Glossary: Absorption Spectrum
 Glossary: Alloy
 Glossary: Base
 Glossary: Cosmogenic isotope
 Glossary: Double Electron Capture
 Glossary: Emission Spectrum
 Glossary: Gamma Ray
 Glossary: Island of Stability
 Isotope: Barium
 Production: Lead
 Production: Uranium
 Reactions: Uranium
 
ranges (1)
 Production: Uranium
 
ranging (4)
 Compounds: Cadmium
 Data1: Molybdenum
 Data1: Neodymium
 Glossary: Allotrope
 
rao (1)
 Reactions: Radium
 
rao2 (1)
 Reactions: Radium
 
raoult (1)
 On This Day... 10 May
 
rapid (8)
 Allotrope: Oxygen
 Allotrope: Sulfur
 Biography: Louis Jacques Thenard
 Country: Outer space
 Data1: Lead
 Data1: Nitrogen
 Data1: Oxygen
 Glossary: Magic Number
 
rapidly (18)
 Biography: Arthur Jeffrey Dempster
 Biography: Ferdinand Frederic Henri Moissan
 Compounds: Palladium
 Compounds: Sodium
 Data1: Chromium
 Data1: Fluorine
 Data1: Lanthanum
 Data1: Mercury
 Document: The Alkali (Group 1) Metals
 Document: The Alkaline Earth Metals (Group 2)
 Document: The Lanthanoid Series
 Glossary: Alkali Metal (alkaline-earth metals)
 Isotope: Uranium
 Production: Indium
 Reactions: Caesium
 Reactions: Potassium
 Reactions: Rubidium
 Reactions: Sodium
 
rare (96)
 Biography: Carl Auer Baron von Welsbach
 Biography: Carl Gustav Mosander
 Biography: Georges Urbain
 Biography: Ida Eva Tacke Noddack
 Biography: Johann August Arfvedson
 Biography: Paul Emile Lecoq de Boisbaudran
 Biography: Per Teodor Cleve
 Biography: Philip Hauge Abelson
 Compounds: Actinium
 Compounds: Astatine
 Compounds: Bismuth
 Compounds: Copper
 Compounds: Francium
 Compounds: Polonium
 Compounds: Radium
 Compounds: Samarium
 Compounds: Strontium
 Compounds: Zirconium
 Country: Brazil
 Country: Chile
 Country: China
 Country: India
 Country: Malaysia
 Country: Outer space
 Country: Russia
 Country: South Africa
 Country: Ukraine
 Data1: Actinium
 Data1: Aluminium
 Data1: Berkelium
 Data1: Cadmium
 Data1: Cerium
 Data1: Dysprosium
 Data1: Einsteinium
 Data1: Erbium
 Data1: Europium
 Data1: Fermium
 Data1: Gadolinium
 Data1: Holmium
 Data1: Iodine
 Data1: Iridium
 Data1: Lanthanum
 Data1: Lawrencium
 Data1: Lutetium
 Data1: Neodymium
 Data1: Neon
 Data1: Neptunium
 Data1: Praseodymium
 Data1: Samarium
 Data1: Scandium
 Data1: Terbium
 Data1: Thulium
 Data1: Xenon
 Data1: Yttrium
 Document: The Actinoid Series
 Document: The Alkali (Group 1) Metals
 Document: The Alkaline Earth Metals (Group 2)
 Document: The Lanthanoid Series
 Glossary: Actinides
 Glossary: Actinoids
 Glossary: Allotrope
 Glossary: Cosmogenic isotope
 Glossary: Lanthanides (old name)
 Glossary: Rare Earth Elements
 Glossary: Transactinides
 Isotope: Neptunium
 On This Day... 8 May
 On This Day... 9 September
 Production: Aluminium
 Production: Cadmium
 Production: Cerium
 Production: Chromium
 Production: Dysprosium
 Production: Erbium
 Production: Europium
 Production: Gadolinium
 Production: Holmium
 Production: Iodine
 Production: Iron
 Production: Lanthanum
 Production: Lead
 Production: Lutetium
 Production: Mercury
 Production: Neodymium
 Production: Neon
 Production: Platinum
 Production: Polonium
 Production: Praseodymium
 Production: Samarium
 Production: Scandium
 Production: Technetium
 Production: Thallium
 Production: Thorium
 Production: Thulium
 Production: Ytterbium
 Production: Yttrium
 
rarely (13)
 Biography: (Gabriel) Daniel Fahrenheit
 Compounds: Cobalt
 Compounds: Zirconium
 Data1: Copper
 Data1: Lead
 Data1: Mercury
 Data1: Niobium
 Data1: Osmium
 Data1: Technetium
 Data1: Terbium
 Glossary: Thermal Conductivity
 Isotope: Hydrogen
 Production: Arsenic
 
rarer (2)
 Data1: Praseodymium
 Production: Hydrogen
 
rarest (9)
 Compounds: Astatine
 Compounds: Oxygen
 Data1: Astatine
 Data1: Gallium
 Glossary: Double Beta Decay
 Production: Astatine
 Production: Francium
 Production: Iridium
 Production: Tellurium
 
rarity (5)
 Country: United States of America
 Data1: Neon
 Production: Neon
 Production: Tellurium
 Production: Thulium
 
ras (2)
 Country: Qatar
 Country: United States of America
 
rasaratna (1)
 Data1: Zinc
 
rasavatam (1)
 Data1: Mercury
 
rash (1)
 Data1: Aluminium
 
rashes (2)
 Data1: Magnesium
 Data1: Zinc
 
rasorite (2)
 Country: United States of America
 Production: Boron
 
rat (3)
 Compounds: Barium
 Data1: Barium
 Data1: Thallium
 
rate (8)
 Compounds: Boron
 Data1: Palladium
 Data1: Zinc
 Equation: Graham's Law
 Glossary: Heat Capacity
 Glossary: Young's Modulus
 On This Day... 16 December
 Production: Oxygen
 
rates (1)
 Allotrope: Carbon
 
ratified (4)
 Data1: Lawrencium
 Data1: Ununpentium
 Data1: Ununquadium
 Data1: Ununtrium
 
rating (3)
 Data1: Holmium
 Data1: Lutetium
 Data1: Thulium
 
ratio (71)
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Sir Humphry Davy
 Compounds: Germanium
 Compounds: Lithium
 Country: Outer space
 Data1: Aluminium
 Data1: Cerium
 Data1: Rubidium
 Data2: Aluminium
 Data2: Beryllium
 Data2: Bismuth
 Data2: Cadmium
 Data2: Calcium
 Data2: Cerium
 Data2: Chromium
 Data2: Cobalt
 Data2: Copper
 Data2: Dysprosium
 Data2: Erbium
 Data2: Europium
 Data2: Gadolinium
 Data2: Gold
 Data2: Hafnium
 Data2: Holmium
 Data2: Iridium
 Data2: Iron
 Data2: Lanthanum
 Data2: Lead
 Data2: Lutetium
 Data2: Magnesium
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Nickel
 Data2: Niobium
 Data2: Osmium
 Data2: Palladium
 Data2: Platinum
 Data2: Plutonium
 Data2: Praseodymium
 Data2: Promethium
 Data2: Rhenium
 Data2: Rhodium
 Data2: Ruthenium
 Data2: Samarium
 Data2: Scandium
 Data2: Selenium
 Data2: Silver
 Data2: Strontium
 Data2: Tantalum
 Data2: Terbium
 Data2: Thallium
 Data2: Thorium
 Data2: Thulium
 Data2: Tin
 Data2: Titanium
 Data2: Tungsten
 Data2: Uranium
 Data2: Vanadium
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 Glossary: Alloy
 Glossary: Atomic Mass
 Glossary: Double Electron Capture
 Glossary: Poisson Ratio
 Glossary: Positron Emission (Beta+ Decay)
 Glossary: Spontaneous Fission
 Glossary: Young's Modulus
 On This Day... 22 March
 Production: Zirconium
 
ration (1)
 Reactions: Gold
 
ratios (3)
 Data1: Rubidium
 Glossary: Spontaneous Fission
 Isotope: Strontium
 
ravenna (1)
 Biography: Julius Caesar Scaliger
 
raw (3)
 Compounds: Phosphorus
 Data1: Tungsten
 Production: Argon
 
ray (36)
 Biography: Dirk Coster
 Biography: Irene Joliot-Curie
 Biography: Peter Armbruster
 Data1: Actinium
 Data1: Barium
 Data1: Beryllium
 Data1: Cobalt
 Data1: Curium
 Data1: Hafnium
 Data1: Radium
 Data1: Strontium
 Data1: Technetium
 Data1: Thulium
 Data1: Ytterbium
 Document: The Lanthanoid Series
 Glossary: Cosmogenic isotope
 Glossary: Electron Capture
 Glossary: Gamma Ray
 Glossary: Isometric Transition
 Glossary: X-Rays
 Isotope: Argon
 Isotope: Barium
 Isotope: Beryllium
 Isotope: Chlorine
 Isotope: Cobalt
 Isotope: Gadolinium
 Isotope: Iodine
 Isotope: Thulium
 Isotope: Ytterbium
 On This Day... 19 May
 On This Day... 2 December
 On This Day... 24 March
 On This Day... 25 July
 On This Day... 3 December
 Production: Cadmium
 Production: Rhodium
 
rayleigh (4)
 Biography: John William Strutt Rayleigh
 Biography: Sir William Ramsay
 Data1: Argon
 On This Day... 12 November
 
rayon (1)
 Compounds: Zinc
 
rays (29)
 Biography: Irene Joliot-Curie
 Biography: Lise Meitner
 Biography: Michael Faraday
 Biography: Peter Armbruster
 Biography: Pierre Curie
 Biography: Robert Wilhelm Bunsen
 Biography: Sir William Crookes
 Compounds: Iodine
 Compounds: Oxygen
 Compounds: Silver
 Data1: Americium
 Data1: Radium
 Data1: Technetium
 Data1: Uranium
 Glossary: Double Electron Capture
 Glossary: Electron Capture
 Glossary: Gamma Ray
 Glossary: Photon
 Glossary: Radiation
 Glossary: X-Rays
 Isotope: Hydrogen
 Isotope: Ytterbium
 On This Day... 16 December
 On This Day... 2 July
 On This Day... 23 January
 On This Day... 24 March
 On This Day... 27 March
 Production: Cadmium
 Reactions: Krypton
 
razor (1)
 Data1: Cobalt
 
rb (8)
 Atomic data: Rubidium
 Data1: Rubidium
 Data2: Rubidium
 Isotope: Krypton
 Isotope: Rubidium
 Isotope: Strontium
 Reactions: Rubidium
 Spectrum: Rubidium
 
rb+ (2)
 Atomic data: Rubidium
 Reactions: Rubidium
 
rb+1 (1)
 Data2: Rubidium
 
rb2o (1)
 Production: Rubidium
 
rb2o2 (1)
 Production: Rubidium
 
rb2o3 (1)
 Production: Rubidium
 
rb2te (1)
 Compounds: Rubidium
 
rbbr (1)
 Reactions: Rubidium
 
rbcl (1)
 Reactions: Rubidium
 
rbf (1)
 Reactions: Rubidium
 
rbi (1)
 Reactions: Rubidium
 
rbo2 (2)
 Production: Rubidium
 Reactions: Rubidium
 
rboh (1)
 Reactions: Rubidium
 
rc (3)
 Data2: Gadolinium
 Data2: Indium
 Data2: Thorium
 
rdx (1)
 Compounds: Nitrogen
 
re (19)
 Atomic data: Rhenium
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Irene Joliot-Curie
 Compounds: Silicon
 Compounds: Titanium
 Country: United Kingdom
 Data1: Rhenium
 Data1: Yttrium
 Data2: Niobium
 Data2: Rhenium
 Data2: Thallium
 Glossary: Air
 Glossary: Emission Spectrum
 Isotope: Osmium
 Isotope: Rhenium
 Isotope: Tungsten
 Production: Rhenium
 Reactions: Rhenium
 Spectrum: Rhenium
 
re+ (1)
 Atomic data: Rhenium
 
re+1 (1)
 Data2: Rhenium
 
re+2 (1)
 Data2: Rhenium
 
re+3 (1)
 Data2: Rhenium
 
re+4 (1)
 Data2: Rhenium
 
re+5 (1)
 Data2: Rhenium
 
re+6 (1)
 Data2: Rhenium
 
re+7 (1)
 Data2: Rhenium
 
re0 (1)
 Data2: Rhenium
 
re2o7 (1)
 Reactions: Rhenium
 
re3+ (1)
 Reactions: Rhenium
 
reach (7)
 Biography: (Gabriel) Daniel Fahrenheit
 Biography: Robert Wilhelm Bunsen
 Data1: Tantalum
 Equation: Charles' Law
 Glossary: Group
 Glossary: Island of Stability
 Production: Aluminium
 
reached (4)
 Biography: Robert Wilhelm Bunsen
 Data1: Gold
 Data1: Tantalum
 Glossary: Kelvin (absolute temperature)
 
reaches (4)
 Compounds: Chlorine
 Compounds: Sodium
 Data1: Titanium
 Equation: Charles' Law
 
reaching (3)
 Allotrope: Oxygen
 Biography: Albert Ghiorso
 Country: Australia
 
react (72)
 Biography: Sir Humphry Davy
 Compounds: Oxygen
 Compounds: Plutonium
 Compounds: Radon
 Data1: Antimony
 Data1: Calcium
 Data1: Copper
 Data1: Gadolinium
 Data1: Krypton
 Data1: Nitrogen
 Document: The Actinoid Series
 Document: The Alkali (Group 1) Metals
 Document: The Alkaline Earth Metals (Group 2)
 Document: The Lanthanoid Series
 Glossary: Acid
 Glossary: Alkali Metal
 Glossary: Alkali Metal (alkaline-earth metals)
 Glossary: Base
 Glossary: Group
 Glossary: Halogens
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 Reactions: Antimony
 Reactions: Argon
 Reactions: Arsenic
 Reactions: Beryllium
 Reactions: Boron
 Reactions: Bromine
 Reactions: Cadmium
 Reactions: Carbon
 Reactions: Chromium
 Reactions: Cobalt
 Reactions: Copper
 Reactions: Fluorine
 Reactions: Gold
 Reactions: Hafnium
 Reactions: Hydrogen
 Reactions: Iodine
 Reactions: Iridium
 Reactions: Krypton
 Reactions: Lead
 Reactions: Magnesium
 Reactions: Manganese
 Reactions: Mercury
 Reactions: Molybdenum
 Reactions: Neon
 Reactions: Nickel
 Reactions: Niobium
 Reactions: Nitrogen
 Reactions: Osmium
 Reactions: Oxygen
 Reactions: Phosphorus
 Reactions: Platinum
 Reactions: Plutonium
 Reactions: Polonium
 Reactions: Radon
 Reactions: Rhenium
 Reactions: Rhodium
 Reactions: Ruthenium
 Reactions: Selenium
 Reactions: Silicon
 Reactions: Silver
 Reactions: Sulfur
 Reactions: Tantalum
 Reactions: Technetium
 Reactions: Tellurium
 Reactions: Titanium
 Reactions: Tungsten
 Reactions: Uranium
 Reactions: Xenon
 Reactions: Zinc
 Reactions: Zirconium
 
reactant (1)
 Glossary: Reagent
 
reactants (3)
 Biography: Antoine-Laurent de Lavoisier
 Glossary: Decay Energy
 Glossary: Enzyme
 
reacted (2)
 Production: Iodine
 Production: Magnesium
 
reacting (12)
 Biography: Antoine Alexandre Brutus Bussy
 Compounds: Nitrogen
 Compounds: Oxygen
 Data1: Beryllium
 Data1: Hydrogen
 Data1: Nitrogen
 Data1: Sodium
 Data1: Titanium
 Document: The Alkali (Group 1) Metals
 Glossary: Halogens
 Production: Tantalum
 Reactions: Xenon
 
reaction (129)
 Allotrope: Arsenic
 Biography: Antoine-Laurent de Lavoisier
 Biography: Arthur Jeffrey Dempster
 Biography: Enrico Fermi
 Biography: Gottfried Münzenberg
 Biography: Ida Eva Tacke Noddack
 Biography: Joseph Louis Gay-Lussac
 Biography: Peter Armbruster
 Compounds: Cobalt
 Compounds: Copper
 Compounds: Iron
 Compounds: Lithium
 Compounds: Magnesium
 Compounds: Mercury
 Compounds: Silver
 Compounds: Sodium
 Compounds: Sulfur
 Country: Outer space
 Data1: Boron
 Data1: Europium
 Data1: Gallium
 Data1: Hydrogen
 Data1: Roentgenium
 Data1: Sodium
 Data1: Ununbium
 Data1: Ununhexium
 Document: The Alkali (Group 1) Metals
 Document: The Lanthanoid Series
 Equation: Reaction quotient
 Glossary: Amphoteric
 Glossary: Aqua regia
 Glossary: Base
 Glossary: Catalyst
 Glossary: Element
 Glossary: Endothermic
 Glossary: Enzyme
 Glossary: Exothermic
 Glossary: Reagent
 Glossary: Reduction
 Isotope: Beryllium
 Isotope: Hydrogen
 Isotope: Plutonium
 Isotope: Uranium
 Isotope: Xenon
 On This Day... 1 April
 On This Day... 10 July
 On This Day... 16 June
 On This Day... 2 December
 On This Day... 2 November
 On This Day... 23 January
 On This Day... 26 November
 On This Day... 6 February
 On This Day... 7 December
 On This Day... 8 October
 Production: Aluminium
 Production: Boron
 Production: Francium
 Production: Helium
 Production: Hydrogen
 Production: Iodine
 Production: Iron
 Production: Neptunium
 Reactions: Aluminium
 Reactions: Antimony
 Reactions: Arsenic
 Reactions: Barium
 Reactions: Beryllium
 Reactions: Bismuth
 Reactions: Boron
 Reactions: Bromine
 Reactions: Cadmium
 Reactions: Caesium
 Reactions: Calcium
 Reactions: Carbon
 Reactions: Cerium
 Reactions: Chlorine
 Reactions: Chromium
 Reactions: Cobalt
 Reactions: Copper
 Reactions: Fluorine
 Reactions: Gallium
 Reactions: Germanium
 Reactions: Gold
 Reactions: Hafnium
 Reactions: Hydrogen
 Reactions: Indium
 Reactions: Iodine
 Reactions: Iridium
 Reactions: Iron
 Reactions: Lanthanum
 Reactions: Lead
 Reactions: Lithium
 Reactions: Magnesium
 Reactions: Manganese
 Reactions: Mercury
 Reactions: Molybdenum
 Reactions: Nickel
 Reactions: Niobium
 Reactions: Nitrogen
 Reactions: Osmium
 Reactions: Oxygen
 Reactions: Palladium
 Reactions: Phosphorus
 Reactions: Platinum
 Reactions: Plutonium
 Reactions: Potassium
 Reactions: Radium
 Reactions: Rhenium
 Reactions: Rhodium
 Reactions: Rubidium
 Reactions: Ruthenium
 Reactions: Scandium
 Reactions: Selenium
 Reactions: Silicon
 Reactions: Silver
 Reactions: Sodium
 Reactions: Strontium
 Reactions: Sulfur
 Reactions: Tantalum
 Reactions: Tellurium
 Reactions: Thallium
 Reactions: Thorium
 Reactions: Tin
 Reactions: Titanium
 Reactions: Tungsten
 Reactions: Uranium
 Reactions: Vanadium
 Reactions: Zinc
 Reactions: Zirconium
 
reactive (37)
 Allotrope: Phosphorus
 Compounds: Hydrogen
 Compounds: Nitrogen
 Compounds: Oxygen
 Compounds: Palladium
 Compounds: Sulfur
 Data1: Bromine
 Data1: Calcium
 Data1: Cerium
 Data1: Europium
 Data1: Fluorine
 Data1: Helium
 Data1: Lanthanum
 Data1: Nitrogen
 Data1: Radium
 Data1: Strontium
 Document: The Alkali (Group 1) Metals
 Document: The Halogens (Group 17)
 Document: The Lanthanoid Series
 Glossary: Alkali Metal (alkaline-earth metals)
 Glossary: Atomic Charge
 Glossary: Group
 Glossary: Halogens
 Glossary: Pyrophoric
 Isotope: Boron
 Production: Aluminium
 Reactions: Bromine
 Reactions: Calcium
 Reactions: Chlorine
 Reactions: Cobalt
 Reactions: Fluorine
 Reactions: Iodine
 Reactions: Rhenium
 Reactions: Scandium
 Reactions: Strontium
 Reactions: Technetium
 Reactions: Yttrium
 
reactives (1)
 Data1: Nitrogen
 
reactivity (48)
 Data1: Barium
 Data1: Fluorine
 Data1: Lithium
 Data1: Phosphorus
 Data1: Sulfur
 Data1: Tantalum
 Data1: Zinc
 Document: The Alkali (Group 1) Metals
 Document: The Halogens (Group 17)
 Document: The Noble Gases (Group 18)
 Glossary: Acid
 Glossary: Alloy
 Glossary: Halogens
 Glossary: Metals
 Glossary: Noble Gasses (inert gasses)
 Glossary: Valence Electron Potential
 Isotope: Boron
 On This Day... 16 December
 Production: Arsenic
 Production: Fluorine
 Production: Lithium
 Production: Phosphorus
 Reactions: Americium
 Reactions: Berkelium
 Reactions: Bohrium
 Reactions: Californium
 Reactions: Curium
 Reactions: Darmstadtium
 Reactions: Dubnium
 Reactions: Einsteinium
 Reactions: Fermium
 Reactions: Francium
 Reactions: Hassium
 Reactions: Lawrencium
 Reactions: Meitnerium
 Reactions: Mendelevium
 Reactions: Nobelium
 Reactions: Protactinium
 Reactions: Roentgenium
 Reactions: Rutherfordium
 Reactions: Seaborgium
 Reactions: Ununbium
 Reactions: Ununhexium
 Reactions: Ununoctium
 Reactions: Ununpentium
 Reactions: Ununquadium
 Reactions: Ununseptium
 Reactions: Ununtrium
 
reactor (20)
 Compounds: Hafnium
 Compounds: Iodine
 Data1: Actinium
 Data1: Americium
 Data1: Cadmium
 Data1: Californium
 Data1: Einsteinium
 Data1: Hafnium
 Data1: Lithium
 Data1: Plutonium
 Data1: Promethium
 Isotope: Boron
 Isotope: Cobalt
 Isotope: Plutonium
 Isotope: Thallium
 Isotope: Thulium
 Production: Actinium
 Production: Einsteinium
 Production: Plutonium
 Reactions: Uranium
 
reactors (26)
 Allotrope: Carbon
 Compounds: Lithium
 Compounds: Niobium
 Compounds: Zirconium
 Data1: Dysprosium
 Data1: Holmium
 Data1: Neptunium
 Data1: Niobium
 Data1: Plutonium
 Data1: Samarium
 Data1: Sodium
 Data1: Tantalum
 Data1: Technetium
 Data1: Uranium
 Document: The Actinoid Series
 Isotope: Boron
 Isotope: Iodine
 Isotope: Krypton
 Isotope: Plutonium
 Isotope: Uranium
 Isotope: Xenon
 Production: Palladium
 Production: Plutonium
 Production: Polonium
 Production: Technetium
 Production: Xenon
 
reacts (87)
 Allotrope: Arsenic
 Compounds: Nitrogen
 Compounds: Plutonium
 Compounds: Silicon
 Compounds: Sulfur
 Compounds: Zirconium
 Data1: Aluminium
 Data1: Bromine
 Data1: Caesium
 Data1: Fluorine
 Data1: Lanthanum
 Data1: Lithium
 Data1: Magnesium
 Data1: Potassium
 Data1: Rubidium
 Data1: Sulfur
 Data1: Titanium
 Data2: Chlorine
 Document: The Alkaline Earth Metals (Group 2)
 Glossary: Alkali Metal (alkaline-earth metals)
 Glossary: Allotrope
 Production: Hydrogen
 Production: Iron
 Reactions: Aluminium
 Reactions: Antimony
 Reactions: Arsenic
 Reactions: Astatine
 Reactions: Barium
 Reactions: Beryllium
 Reactions: Bismuth
 Reactions: Boron
 Reactions: Bromine
 Reactions: Cadmium
 Reactions: Caesium
 Reactions: Calcium
 Reactions: Carbon
 Reactions: Cerium
 Reactions: Chlorine
 Reactions: Chromium
 Reactions: Cobalt
 Reactions: Copper
 Reactions: Dysprosium
 Reactions: Erbium
 Reactions: Europium
 Reactions: Fluorine
 Reactions: Gadolinium
 Reactions: Germanium
 Reactions: Gold
 Reactions: Holmium
 Reactions: Hydrogen
 Reactions: Iodine
 Reactions: Iridium
 Reactions: Iron
 Reactions: Lanthanum
 Reactions: Lead
 Reactions: Lithium
 Reactions: Lutetium
 Reactions: Mercury
 Reactions: Neodymium
 Reactions: Neptunium
 Reactions: Nickel
 Reactions: Osmium
 Reactions: Phosphorus
 Reactions: Plutonium
 Reactions: Potassium
 Reactions: Praseodymium
 Reactions: Radium
 Reactions: Radon
 Reactions: Rhodium
 Reactions: Rubidium
 Reactions: Ruthenium
 Reactions: Samarium
 Reactions: Selenium
 Reactions: Silicon
 Reactions: Sodium
 Reactions: Strontium
 Reactions: Sulfur
 Reactions: Tellurium
 Reactions: Terbium
 Reactions: Thallium
 Reactions: Thulium
 Reactions: Tin
 Reactions: Titanium
 Reactions: Tungsten
 Reactions: Vanadium
 Reactions: Ytterbium
 Reactions: Zinc
 
read (3)
 Biography: Michael Faraday
 Compounds: Potassium
 Data1: Technetium
 
readily (57)
 Allotrope: Plutonium
 Biography: Robert Wilhelm Bunsen
 Compounds: Plutonium
 Data1: Caesium
 Data1: Chlorine
 Data1: Dysprosium
 Data1: Fluorine
 Data1: Holmium
 Data1: Lanthanum
 Data1: Polonium
 Data1: Zirconium
 Document: The Actinoid Series
 Document: The Alkali (Group 1) Metals
 Document: The Alkaline Earth Metals (Group 2)
 Document: The Lanthanoid Series
 Glossary: Alkali Metal
 Glossary: Alkali Metal (alkaline-earth metals)
 Glossary: Electrical Resistivity
 Glossary: Group
 Glossary: Hygroscopic
 Glossary: Moh's Scale of Hardness
 Production: Beryllium
 Production: Helium
 Reactions: Aluminium
 Reactions: Barium
 Reactions: Beryllium
 Reactions: Cadmium
 Reactions: Caesium
 Reactions: Calcium
 Reactions: Cerium
 Reactions: Dysprosium
 Reactions: Erbium
 Reactions: Europium
 Reactions: Gadolinium
 Reactions: Holmium
 Reactions: Iron
 Reactions: Lanthanum
 Reactions: Lithium
 Reactions: Lutetium
 Reactions: Magnesium
 Reactions: Manganese
 Reactions: Neodymium
 Reactions: Nickel
 Reactions: Plutonium
 Reactions: Potassium
 Reactions: Praseodymium
 Reactions: Promethium
 Reactions: Radium
 Reactions: Rubidium
 Reactions: Samarium
 Reactions: Scandium
 Reactions: Sodium
 Reactions: Strontium
 Reactions: Terbium
 Reactions: Thulium
 Reactions: Ytterbium
 Reactions: Yttrium
 
reading (2)
 Biography: Sir Humphry Davy
 Glossary: Metalloids
 
ready (1)
 Data1: Caesium
 
reagent (9)
 Biography: George Charles de Hevesy
 Compounds: Nitrogen
 Compounds: Potassium
 Compounds: Zinc
 Data1: Bromine
 Data1: Manganese
 Glossary: Reagent
 On This Day... 25 June
 On This Day... 6 May
 
reagents (4)
 Biography: Robert Wilhelm Bunsen
 Compounds: Nitrogen
 Data1: Tantalum
 Glossary: Aqua regia
 
real (5)
 Biography: Julius Caesar Scaliger
 Data1: Promethium
 Data1: Radium
 Equation: Avogadro's law
 Glossary: Viscosity
 
realgar (2)
 Country: Iran
 Production: Arsenic
 
realised (3)
 Biography: Irene Joliot-Curie
 Compounds: Nitrogen
 On This Day... 12 January
 
reality (2)
 Glossary: Energy Levels
 Glossary: Isotope
 
realize (1)
 Biography: Joseph Priestley
 
realized (6)
 Biography: Robert Wilhelm Bunsen
 Data1: Fluorine
 Data1: Molybdenum
 Data1: Thorium
 Glossary: Magic Number
 Production: Fluorine
 
realizing (1)
 Data1: Titanium
 
really (3)
 Data1: Lead
 Document: The Halogens (Group 17)
 Production: Vanadium
 
realm (1)
 Biography: Ida Eva Tacke Noddack
 
rearranged (1)
 Biography: John Dalton
 
rearrangement (4)
 On This Day... 14 January
 On This Day... 22 July
 On This Day... 27 March
 On This Day... 27 May
 
reason (13)
 Biography: Pierre Curie
 Biography: Walter Noddack
 Compounds: Iodine
 Compounds: Lithium
 Compounds: Nitrogen
 Data1: Germanium
 Glossary: Acid
 Glossary: Double Electron Capture
 Glossary: Temperature
 Glossary: Thermal Conductivity
 Isotope: Cobalt
 Production: Iron
 Production: Technetium
 
reasonable (2)
 Data1: Plutonium
 Production: Uranium
 
reasonably (3)
 Data1: Erbium
 Data1: Sodium
 Production: Thallium
 
reasoned (1)
 Glossary: Electron Volt
 
reasoning (1)
 Biography: Julius Caesar Scaliger
 
reb2 (2)
 Compounds: Boron
 Compounds: Rhenium
 
rebounded (1)
 Production: Copper
 
rebounds (1)
 Glossary: Enthalpy Change of Fusion (Heat of Fusion)
 
rebreathers (1)
 Compounds: Lithium
 
rebuilt (1)
 Production: Aluminium
 
recall (2)
 Glossary: Periods
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recast (1)
 Biography: George Charles de Hevesy
 
receive (1)
 Biography: Enrico Fermi
 
received (26)
 Biography: Albert Ghiorso
 Biography: Dale R. Corson
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 Biography: Gottfried Münzenberg
 Biography: Hans Christian Oersted
 Biography: John William Strutt Rayleigh
 Biography: Jöns Jacob Berzelius
 Biography: Joseph Louis Gay-Lussac
 Biography: Joseph W. Kennedy
 Biography: Julius Caesar Scaliger
 Biography: Karl Wilhelm Scheele
 Biography: Lise Meitner
 Biography: Louis Jacques Thenard
 Biography: Otto Hahn
 Biography: Peter Armbruster
 Biography: Pierre Curie
 Biography: Robert Wilhelm Bunsen
 Biography: Sir Humphry Davy
 Biography: Sir William Ramsay
 Data1: Chromium
 Glossary: Emission Spectrum
 Isotope: Calcium
 On This Day... 15 February
 On This Day... 31 October
 
receiving (2)
 Biography: Karl Wilhelm Scheele
 Biography: Robert Wilhelm Bunsen
 
recent (8)
 Allotrope: Carbon
 Country: Democratic Republic of Congo
 Data1: Phosphorus
 Data1: Terbium
 Production: Nickel
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 Production: Samarium
 Production: Technetium
 
recently (32)
 Allotrope: Carbon
 Allotrope: Oxygen
 Biography: Eugene-Antole Demarcay
 Biography: William Hyde Wollaston
 Compounds: Nitrogen
 Compounds: Potassium
 Compounds: Sodium
 Compounds: Xenon
 Compounds: Zirconium
 Country: Outer space
 Country: Russia
 Data1: Europium
 Data1: Fluorine
 Data1: Gadolinium
 Data1: Gallium
 Data1: Lead
 Data1: Lutetium
 Data1: Ruthenium
 Data1: Technetium
 Data1: Tungsten
 Data1: Xenon
 Data1: Zirconium
 Document: The Noble Gases (Group 18)
 Glossary: Magnetic Ordering
 Glossary: Noble Gasses (inert gasses)
 Isotope: Darmstadtium
 Production: Cadmium
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rechargable (1)
 Compounds: Nickel
 
recipes (1)
 Compounds: Potassium
 
recipients (1)
 Biography: Robert Wilhelm Bunsen
 
recluse (1)
 Biography: Henry Cavendish
 
recognise (1)
 Biography: Johann Schroder
 
recognised (2)
 Data1: Cobalt
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recognition (11)
 Biography: Antoine-Laurent de Lavoisier
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 Biography: Pierre Curie
 Biography: Robert Wilhelm Bunsen
 Data1: Seaborgium
 On This Day... 10 December
 On This Day... 15 December
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 On This Day... 27 March
 On This Day... 31 January
 
recognize (5)
 Biography: Baron Axel Fredrik Cronstedt
 Biography: Julius Caesar Scaliger
 Data1: Boron
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recognized (12)
 Biography: Antoine-Laurent de Lavoisier
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Henry Cavendish
 Data1: Antimony
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 On This Day... 19 April
 Production: Zirconium
 
recoil (4)
 Biography: Peter Armbruster
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 Glossary: Spontaneous Fission
 
recoiled (1)
 Data1: Lawrencium
 
recollection (1)
 Biography: Emilio Gino Segre
 
recommend (1)
 Production: Radon
 
recommendation (1)
 Glossary: Electron Volt
 
recommendations (1)
 Glossary: IUPAC
 
recommended (7)
 Compounds: Sodium
 Compounds: Zinc
 Data1: Bohrium
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 Data1: Seaborgium
 
recommends (3)
 Glossary: Actinides
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 Production: Radon
 
record (5)
 Biography: Joseph Louis Gay-Lussac
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 On This Day... 8 November
 
recorded (1)
 Biography: Michael Faraday
 
recording (1)
 Compounds: Chromium
 
records (3)
 Biography: Jöns Jacob Berzelius
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 Production: Astatine
 
recover (8)
 Country: Israel
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 On This Day... 7 March
 Production: Gold
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recoverable (1)
 Production: Thallium
 
recovered (17)
 Country: Argentina
 Country: Chile
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 Data1: Carbon
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 Production: Bromine
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recovers (1)
 Country: Russia
 
recovery (9)
 Biography: Robert Wilhelm Bunsen
 Country: Canada
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 On This Day... 10 January
 Production: Aluminium
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recrystallization (1)
 Data1: Hafnium
 
recrystallized (1)
 Data1: Lanthanum
 
rectangle (1)
 Document: Understanding Electron Configuration Tables
 
rectifiers (2)
 Data1: Germanium
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rectifying (1)
 Data1: Germanium
 
rector (1)
 Biography: William Gregor
 
recuperation (1)
 Biography: John William Strutt Rayleigh
 
recur (1)
 Glossary: Periodic Law
 
recycle (1)
 Biography: Robert Wilhelm Bunsen
 
recycled (10)
 Country: China
 Country: Germany
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 Country: Kazakhstan
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 Data1: Bromine
 
recycling (5)
 Production: Aluminium
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red (60)
 Allotrope: Boron
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 Allotrope: Phosphorus
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 Allotrope: Sulfur
 Biography: Antoine-Jerome Balard
 Biography: Louis Nicolas Vauquelin
 Biography: Pierre Jules César Janssen
 Biography: Robert Wilhelm Bunsen
 Compounds: Aluminium
 Compounds: Cadmium
 Compounds: Fluorine
 Compounds: Indium
 Compounds: Iodine
 Compounds: Iron
 Compounds: Lead
 Compounds: Nitrogen
 Compounds: Phosphorus
 Compounds: Radium
 Compounds: Ruthenium
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 Compounds: Yttrium
 Country: Outer space
 Data1: Bromine
 Data1: Cadmium
 Data1: Chromium
 Data1: Curium
 Data1: Europium
 Data1: Lead
 Data1: Lithium
 Data1: Molybdenum
 Data1: Phosphorus
 Data1: Radium
 Data1: Radon
 Data1: Rhodium
 Data1: Rubidium
 Data1: Selenium
 Data1: Technetium
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 Data1: Vanadium
 Data1: Yttrium
 Data2: Phosphorus
 Glossary: Absorption Spectrum
 Glossary: Allotrope
 Glossary: Aqua regia
 On This Day... 24 July
 On This Day... 26 April
 On This Day... 30 October
 Production: Arsenic
 Production: Iron
 Production: Technetium
 Reactions: Antimony
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reddish (5)
 Biography: William Gregor
 Compounds: Chlorine
 Data1: Bismuth
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redetermined (1)
 On This Day... 11 April
 
rediscovered (7)
 Biography: Charles Hatchett
 Biography: Hennig Brand
 Biography: Martin Heinrich Klaproth
 Data1: Hydrogen
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redistillation (1)
 Production: Zinc
 
redistribute (1)
 Biography: Michael Faraday
 
redondo (1)
 Biography: Edwin Mattison McMillan
 
redox (2)
 Data1: Europium
 Production: Hydrogen
 
reduce (16)
 Compounds: Calcium
 Compounds: Chlorine
 Compounds: Magnesium
 Compounds: Phosphorus
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 Country: Canada
 Data1: Copper
 Data1: Phosphorus
 Data1: Titanium
 Glossary: Base
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 Production: Hydrogen
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 Production: Zinc
 
reduced (12)
 Allotrope: Carbon
 Biography: Emilio Gino Segre
 Biography: Joseph Louis Gay-Lussac
 Data1: Erbium
 Data1: Lead
 Data1: Vanadium
 Data1: Zinc
 On This Day... 26 April
 Production: Aluminium
 Production: Hydrogen
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reduces (2)
 Compounds: Magnesium
 Production: Iron
 
reducing (25)
 Biography: Pierre Jules César Janssen
 Compounds: Boron
 Compounds: Magnesium
 Data1: Calcium
 Data1: Helium
 Data1: Niobium
 Data1: Nitrogen
 Data1: Titanium
 Data1: Tungsten
 Equation: Boyle's Law
 Glossary: Air
 Isotope: Plutonium
 Production: Beryllium
 Production: Boron
 Production: Chromium
 Production: Hafnium
 Production: Hydrogen
 Production: Rhenium
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 Reactions: Iron
 
reduction (94)
 Compounds: Europium
 Data1: Boron
 Data1: Dysprosium
 Data1: Manganese
 Data1: Rhodium
 Data1: Tin
 Data1: Tungsten
 Data1: Yttrium
 Glossary: Oxidation State
 Glossary: Reduction
 On This Day... 21 October
 Production: Actinium
 Production: Aluminium
 Production: Boron
 Production: Gadolinium
 Production: Holmium
 Production: Iron
 Production: Lutetium
 Production: Magnesium
 Production: Neptunium
 Production: Tantalum
 Production: Tellurium
 Production: Thulium
 Production: Tin
 Production: Uranium
 Production: Vanadium
 Production: Zirconium
 Reactions: Aluminium
 Reactions: Antimony
 Reactions: Arsenic
 Reactions: Barium
 Reactions: Beryllium
 Reactions: Bismuth
 Reactions: Boron
 Reactions: Bromine
 Reactions: Cadmium
 Reactions: Caesium
 Reactions: Calcium
 Reactions: Carbon
 Reactions: Cerium
 Reactions: Chlorine
 Reactions: Chromium
 Reactions: Cobalt
 Reactions: Copper
 Reactions: Fluorine
 Reactions: Gallium
 Reactions: Germanium
 Reactions: Gold
 Reactions: Hafnium
 Reactions: Hydrogen
 Reactions: Indium
 Reactions: Iodine
 Reactions: Iridium
 Reactions: Iron
 Reactions: Lanthanum
 Reactions: Lead
 Reactions: Lithium
 Reactions: Magnesium
 Reactions: Manganese
 Reactions: Mercury
 Reactions: Molybdenum
 Reactions: Nickel
 Reactions: Niobium
 Reactions: Nitrogen
 Reactions: Osmium
 Reactions: Oxygen
 Reactions: Palladium
 Reactions: Phosphorus
 Reactions: Platinum
 Reactions: Plutonium
 Reactions: Potassium
 Reactions: Radium
 Reactions: Rhenium
 Reactions: Rhodium
 Reactions: Rubidium
 Reactions: Ruthenium
 Reactions: Scandium
 Reactions: Selenium
 Reactions: Silicon
 Reactions: Silver
 Reactions: Sodium
 Reactions: Strontium
 Reactions: Sulfur
 Reactions: Tantalum
 Reactions: Tellurium
 Reactions: Thallium
 Reactions: Thorium
 Reactions: Tin
 Reactions: Titanium
 Reactions: Tungsten
 Reactions: Uranium
 Reactions: Vanadium
 Reactions: Zinc
 Reactions: Zirconium
 
reef (3)
 Country: South Africa
 Production: Palladium
 Production: Platinum
 
reentry (2)
 Allotrope: Carbon
 Compounds: Hafnium
 
reese (1)
 On This Day... 4 November
 
ref6 (1)
 Reactions: Rhenium
 
ref7 (1)
 Reactions: Rhenium
 
refer (6)
 Biography: Michael Faraday
 Data1: Francium
 Data1: Manganese
 Data1: Niobium
 Glossary: Abundance
 Glossary: Speed of Sound
 
refered (1)
 Allotrope: Carbon
 
references (1)
 Data1: Zinc
 
referred (15)
 Biography: Karl Wilhelm Scheele
 Compounds: Iron
 Compounds: Nitrogen
 Data1: Fluorine
 Data1: Francium
 Data1: Tin
 Document: The Halogens (Group 17)
 Document: The Noble Gases (Group 18)
 Equation: Avogadro's law
 Glossary: Electron Emission (Beta- Decay)
 Glossary: Melting Point (freezing point)
 Glossary: Positron Emission (Beta+ Decay)
 Glossary: Thermal Conductivity
 Glossary: X-Rays
 Production: Fluorine
 
refers (10)
 Biography: Pierre Curie
 Data1: Nitrogen
 Data1: Sodium
 Data1: Titanium
 Document: The Transition Metals (Groups 3 to 12)
 Glossary: Abundance
 Glossary: Brinell Hardness
 Glossary: Emission Spectrum
 Glossary: Metalloids
 Glossary: Teratogenic
 
refine (1)
 Data1: Titanium
 
refined (76)
 Biography: Jean Charles Galissard de Marignac
 Country: Algeria
 Country: Argentina
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 Country: Belgium
 Country: Brazil
 Country: Bulgaria
 Country: Burma (Myanmar)
 Country: Canada
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 Country: China
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 Country: Democratic People's Republic of Korea
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 Country: Egypt
 Country: Estonia
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 Country: France
 Country: Germany
 Country: Greece
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 Country: Switzerland
 Country: Taiwan
 Country: Thailand
 Country: Trinidad and Tobago
 Country: Turkey
 Country: Ukraine
 Country: United Arab Emirates
 Country: United Kingdom
 Country: United States of America
 Country: Uzbekistan
 Country: Venezuela
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 Country: Zimbabwe
 Data1: Gold
 Data1: Silver
 Production: Gold
 Production: Lead
 
refinement (3)
 Biography: Joseph Louis Gay-Lussac
 Production: Aluminium
 Production: Hafnium
 
refineries (3)
 Compounds: Fluorine
 Production: Selenium
 Production: Zinc
 
refinery (23)
 Biography: Dmitriy Ivanovich Mendeleyev
 Country: Australia
 Country: Austria
 Country: Brazil
 Country: Canada
 Country: China
 Country: Colombia
 Country: Cuba
 Country: Dominican Republic
 Country: Finland
 Country: France
 Country: Greece
 Country: Indonesia
 Country: Japan
 Country: New Caledonia
 Country: Norway
 Country: Russia
 Country: South Africa
 Country: Ukraine
 Country: United Kingdom
 Country: Venezuela
 Country: Zimbabwe
 Production: Indium
 
refining (27)
 Compounds: Aluminium
 Compounds: Barium
 Compounds: Nitrogen
 Compounds: Sulfur
 Country: Australia
 Country: China
 Country: Germany
 Country: Hungary
 Country: Japan
 Country: Kazakhstan
 Country: Slovakia
 Country: Ukraine
 Country: United Kingdom
 Country: United States of America
 Data1: Cadmium
 Data1: Copper
 Data1: Germanium
 Data1: Mercury
 Data1: Selenium
 Data1: Strontium
 Data1: Tellurium
 Production: Aluminium
 Production: Cadmium
 Production: Gold
 Production: Silver
 Production: Tellurium
 Production: Uranium
 
reflect (1)
 Production: Yttrium
 
reflected (1)
 Data1: Neodymium
 
reflecting (2)
 Biography: William Hyde Wollaston
 Compounds: Indium
 
reflection (2)
 Allotrope: Carbon
 Production: Tellurium
 
reflective (1)
 Compounds: Titanium
 
reflectivity (3)
 Data2: Mercury
 Data2: Tellurium
 Data2: Zinc
 
reflectors (2)
 Data1: Germanium
 Data1: Rhodium
 
reflects (2)
 Biography: William Hyde Wollaston
 Data1: Oxygen
 
reform (1)
 Biography: Antoine-Laurent de Lavoisier
 
reformatsky (1)
 On This Day... 1 April
 
reforming (2)
 Data1: Palladium
 Production: Hydrogen
 
refracting (1)
 Data1: Tantalum
 
refraction (3)
 Compounds: Tantalum
 On This Day... 14 September
 On This Day... 23 June
 
refractive (32)
 Compounds: Aluminium
 Compounds: Germanium
 Compounds: Lutetium
 Compounds: Thallium
 Compounds: Thorium
 Compounds: Titanium
 Compounds: Yttrium
 Data1: Lanthanum
 Data1: Niobium
 Data1: Strontium
 Data1: Thallium
 Data1: Thorium
 Data2: Argon
 Data2: Arsenic
 Data2: Bromine
 Data2: Carbon
 Data2: Chlorine
 Data2: Fluorine
 Data2: Helium
 Data2: Hydrogen
 Data2: Krypton
 Data2: Mercury
 Data2: Neon
 Data2: Nitrogen
 Data2: Oxygen
 Data2: Phosphorus
 Data2: Selenium
 Data2: Sulfur
 Data2: Tellurium
 Data2: Xenon
 Data2: Zinc
 On This Day... 12 February
 
refractories (2)
 Compounds: Zirconium
 Glossary: Refractory
 
refractory (9)
 Compounds: Chromium
 Compounds: Niobium
 Compounds: Tantalum
 Compounds: Titanium
 Compounds: Vanadium
 Compounds: Zirconium
 Data1: Chromium
 Data1: Rhenium
 Glossary: Refractory
 
refrigerant (3)
 Compounds: Barium
 Compounds: Sulfur
 Data1: Neon
 
refrigerants (1)
 Compounds: Fluorine
 
refrigerating (1)
 Data1: Neon
 
refrigeration (4)
 Compounds: Bismuth
 Compounds: Magnesium
 Compounds: Tellurium
 Data1: Fluorine
 
refrigerator (2)
 Compounds: Sodium
 Glossary: Magnetic Ordering
 
refrigerators (1)
 Compounds: Sulfur
 
refueling (1)
 Isotope: Boron
 
refuge (1)
 Biography: Lise Meitner
 
refuse (1)
 Data1: Lead
 
refused (2)
 Biography: Dmitriy Ivanovich Mendeleyev
 Data1: Magnesium
 
regard (3)
 Biography: Michael Faraday
 Compounds: Magnesium
 Compounds: Phosphorus
 
regarded (10)
 Allotrope: Selenium
 Biography: Julius Caesar Scaliger
 Compounds: Cobalt
 Data1: Bismuth
 Data1: Cerium
 Data1: Indium
 Data1: Iridium
 Data1: Lutetium
 Data1: Zirconium
 Isotope: Bismuth
 
regarding (2)
 Biography: Louis Jacques Thenard
 Glossary: IUPAC
 
regardless (1)
 Glossary: Vickers Hardness
 
regia (14)
 Biography: George Charles de Hevesy
 Compounds: Nitrogen
 Data1: Iridium
 Data1: Osmium
 Data1: Palladium
 Data1: Rhodium
 Data1: Ruthenium
 Data1: Tantalum
 Glossary: Aqua regia
 Glossary: Reagent
 Production: Gold
 Reactions: Gold
 Reactions: Iridium
 Reactions: Rhodium
 
region (18)
 Biography: Ferdinand Reich
 Biography: Joseph Louis Gay-Lussac
 Compounds: Aluminium
 Compounds: Oxygen
 Country: Canada
 Country: Madagascar
 Country: Norway
 Country: Peru
 Data1: Osmium
 Data1: Radon
 Data1: Rhodium
 Data1: Technetium
 Data1: Ununhexium
 Production: Mercury
 Production: Neon
 Production: Nickel
 Production: Osmium
 Production: Rhodium
 
regions (7)
 Country: Outer space
 Data1: Copper
 Data1: Sulfur
 Production: Mercury
 Production: Radon
 Production: Sulfur
 Production: Tantalum
 
register (1)
 Data1: Thulium
 
registered (1)
 Data1: Carbon
 
registry (1)
 Data1: Carbon
 
regius (1)
 Biography: Daniel Rutherford
 
regnault (1)
 On This Day... 21 July
 
regolith (2)
 Isotope: Beryllium
 Isotope: Helium
 
regular (5)
 Allotrope: Carbon
 Data1: Potassium
 Glossary: Amorphous
 Glossary: Magnetic Ordering
 Glossary: Periodic Law
 
regularly (3)
 Data1: Californium
 Isotope: Californium
 Production: Aluminium
 
regulate (1)
 Compounds: Iodine
 
regulated (2)
 Compounds: Chlorine
 Compounds: Sodium
 
regulating (1)
 Compounds: Barium
 
regulation (4)
 Compounds: Chlorine
 Compounds: Sodium
 Data1: Sodium
 Production: Technetium
 
regulations (1)
 Data1: Lead
 
regulator (2)
 Compounds: Sodium
 Data1: Cadmium
 
regulators (2)
 Data1: Boron
 Data1: Indium
 
reheat (1)
 Reactions: Carbon
 
reich (5)
 Biography: Ferdinand Reich
 Biography: Hieronymous Theodor Richter
 Biography: Robert Wilhelm Bunsen
 Data1: Indium
 On This Day... 19 February
 
reichenstein (4)
 Biography: Franz-Joseph Muller Freiherr von Reichenstein
 Data1: Tellurium
 On This Day... 1 July
 On This Day... 13 April
 
reichsanstadt (1)
 Biography: Walter Noddack
 
reichstein (1)
 On This Day... 20 July
 
reinforcing (1)
 Compounds: Magnesium
 
reinhardtii (1)
 Production: Hydrogen
 
rejected (4)
 Biography: Joseph Priestley
 Biography: Julius Caesar Scaliger
 Data1: Lutetium
 Production: Zinc
 
reknowned (1)
 Reactions: Rhodium
 
related (22)
 Biography: Frederick Soddy
 Biography: Institute for Heavy Ion Research (GSI)
 Biography: Sir William Ramsay
 Compounds: Chlorine
 Compounds: Sodium
 Compounds: Vanadium
 Data1: Europium
 Data1: Magnesium
 Data1: Niobium
 Data1: Nitrogen
 Data1: Phosphorus
 Data1: Promethium
 Data1: Radon
 Data1: Technetium
 Data1: Tellurium
 Equation: Boyle's Law
 Glossary: Fahrenheit
 Glossary: IUPAC
 Glossary: Temperature
 Glossary: Thermal Conductivity
 On This Day... 31 July
 Reactions: Palladium
 
relates (1)
 On This Day... 14 January
 
relation (1)
 Biography: Franz-Joseph Muller Freiherr von Reichenstein
 
relations (1)
 On This Day... 13 June
 
relationship (8)
 Biography: Frederick Soddy
 Biography: Joseph Louis Gay-Lussac
 Biography: Lise Meitner
 Biography: Michael Faraday
 Biography: Robert Wilhelm Bunsen
 On This Day... 20 February
 On This Day... 4 August
 On This Day... 7 April
 
relative (20)
 Biography: John Dalton
 Country: Outer space
 Data1: Neon
 Data1: Samarium
 Data1: Zirconium
 Glossary: Abundance
 Glossary: Atomic Mass
 Glossary: Bulk Modulus
 Glossary: Emission Spectrum
 Glossary: Magnetic Ordering
 Glossary: pH
 Glossary: Poisson Ratio
 Isotope: Carbon
 On This Day... 16 February
 On This Day... 24 July
 Production: Europium
 Production: Neon
 Production: Terbium
 Production: Yttrium
 Production: Zirconium
 
relatively (45)
 Biography: Emilio Gino Segre
 Compounds: Boron
 Compounds: Calcium
 Compounds: Chlorine
 Compounds: Hafnium
 Compounds: Phosphorus
 Compounds: Silicon
 Country: Australia
 Country: Oceans / Seas
 Country: Outer space
 Data1: Dysprosium
 Data1: Gold
 Data1: Iridium
 Data1: Lanthanum
 Data1: Lutetium
 Data1: Molybdenum
 Data1: Neodymium
 Data1: Niobium
 Data1: Samarium
 Data1: Tantalum
 Data1: Xenon
 Data1: Yttrium
 Document: The Halogens (Group 17)
 Document: The Lanthanoid Series
 Glossary: Base
 Glossary: Deliquescent
 Glossary: Island of Stability
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 Glossary: Magnetic Ordering
 Isotope: Aluminium
 Isotope: Hassium
 Production: Aluminium
 Production: Astatine
 Production: Bismuth
 Production: Iridium
 Production: Lanthanum
 Production: Lutetium
 Production: Plutonium
 Production: Potassium
 Production: Samarium
 Production: Technetium
 Production: Tin
 Production: Yttrium
 Reactions: Uranium
 
relativistic (3)
 Biography: Gottfried Münzenberg
 Biography: Peter Armbruster
 On This Day... 8 August
 
relaxant (1)
 Compounds: Sodium
 
relaxation (1)
 Biography: Julius Caesar Scaliger
 
relays (2)
 Data1: Palladium
 Data1: Rhodium
 
release (15)
 Biography: Antoine-Laurent de Lavoisier
 Biography: Ida Eva Tacke Noddack
 Compounds: Lithium
 Compounds: Magnesium
 Compounds: Silver
 Compounds: Zinc
 Data1: Calcium
 Data1: Nitrogen
 Document: The Actinoid Series
 Document: The Lanthanoid Series
 Glossary: Spontaneous Fission
 Isotope: Plutonium
 Isotope: Polonium
 Production: Plutonium
 Production: Technetium
 
released (20)
 Biography: Sir Humphry Davy
 Compounds: Boron
 Compounds: Iodine
 Country: Outer space
 Data1: Argon
 Data1: Rhodium
 Document: The Alkali (Group 1) Metals
 Glossary: Decay Energy
 Glossary: Double Electron Capture
 Glossary: Electron Volt
 Glossary: Enthalpy Change of Vapourisation
 Glossary: Isometric Transition
 Isotope: Aluminium
 Isotope: Caesium
 Isotope: Hydrogen
 Isotope: Krypton
 Isotope: Uranium
 On This Day... 16 February
 Production: Plutonium
 Production: Technetium
 
releases (5)
 Compounds: Iron
 Country: Outer space
 Glossary: Exothermic
 Isotope: Plutonium
 Isotope: Uranium
 
releasing (6)
 Compounds: Iodine
 Compounds: Nitrogen
 Compounds: Zinc
 Glossary: Electron Capture
 Production: Aluminium
 Production: Oxygen
 
relevant (1)
 Glossary: Temperature
 
reliability (1)
 Isotope: Plutonium
 
reliable (94)
 Biography: (Gabriel) Daniel Fahrenheit
 Data2: Actinium
 Data2: Aluminium
 Data2: Americium
 Data2: Antimony
 Data2: Arsenic
 Data2: Astatine
 Data2: Barium
 Data2: Berkelium
 Data2: Beryllium
 Data2: Bismuth
 Data2: Boron
 Data2: Bromine
 Data2: Cadmium
 Data2: Caesium
 Data2: Calcium
 Data2: Californium
 Data2: Carbon
 Data2: Cerium
 Data2: Chlorine
 Data2: Chromium
 Data2: Cobalt
 Data2: Copper
 Data2: Curium
 Data2: Dysprosium
 Data2: Erbium
 Data2: Europium
 Data2: Fluorine
 Data2: Francium
 Data2: Gadolinium
 Data2: Gallium
 Data2: Germanium
 Data2: Gold
 Data2: Hafnium
 Data2: Holmium
 Data2: Hydrogen
 Data2: Indium
 Data2: Iodine
 Data2: Iron
 Data2: Lanthanum
 Data2: Lawrencium
 Data2: Lead
 Data2: Lithium
 Data2: Lutetium
 Data2: Magnesium
 Data2: Manganese
 Data2: Mercury
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Neptunium
 Data2: Nickel
 Data2: Niobium
 Data2: Nitrogen
 Data2: Nobelium
 Data2: Osmium
 Data2: Oxygen
 Data2: Palladium
 Data2: Phosphorus
 Data2: Platinum
 Data2: Plutonium
 Data2: Polonium
 Data2: Potassium
 Data2: Praseodymium
 Data2: Promethium
 Data2: Protactinium
 Data2: Radium
 Data2: Rhenium
 Data2: Rhodium
 Data2: Rubidium
 Data2: Ruthenium
 Data2: Samarium
 Data2: Scandium
 Data2: Selenium
 Data2: Silicon
 Data2: Silver
 Data2: Sodium
 Data2: Sulfur
 Data2: Tantalum
 Data2: Technetium
 Data2: Tellurium
 Data2: Terbium
 Data2: Thallium
 Data2: Thorium
 Data2: Thulium
 Data2: Tin
 Data2: Titanium
 Data2: Tungsten
 Data2: Uranium
 Data2: Vanadium
 Data2: Xenon
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 
reliant (1)
 Production: Magnesium
 
relied (1)
 Data1: Neodymium
 
relieve (2)
 Biography: Irene Joliot-Curie
 Compounds: Magnesium
 
relocated (1)
 Biography: Dmitriy Ivanovich Mendeleyev
 
rely (1)
 Data1: Scandium
 
remain (8)
 Biography: Irene Joliot-Curie
 Data1: Barium
 Equation: Boyle's Law
 Glossary: Isotope
 Glossary: Molecule
 Production: Plutonium
 Production: Scandium
 Reactions: Helium
 
remainder (5)
 Biography: Joseph Priestley
 Country: United States of America
 Data1: Chromium
 Production: Helium
 Production: Neptunium
 
remained (14)
 Biography: Antoine Alexandre Brutus Bussy
 Biography: Antoine-Jerome Balard
 Biography: Ida Eva Tacke Noddack
 Biography: John William Strutt Rayleigh
 Biography: Julius Caesar Scaliger
 Biography: Karl Wilhelm Scheele
 Biography: Pierre Curie
 Biography: Robert Wilhelm Bunsen
 Country: Norway
 Data1: Cadmium
 Data1: Lanthanum
 Data1: Nickel
 Data1: Osmium
 Data1: Rhodium
 
remaining (17)
 Biography: Julius Caesar Scaliger
 Compounds: Zinc
 Data1: Americium
 Data1: Curium
 Data1: Einsteinium
 Data1: Helium
 Data1: Iodine
 Data1: Mendelevium
 Data1: Neptunium
 Data1: Protactinium
 Data1: Radium
 Document: The Actinoid Series
 Glossary: Actinides
 Glossary: Actinoids
 Glossary: The Pauling Scale
 Production: Helium
 Production: Lead
 
remains (10)
 Biography: John William Strutt Rayleigh
 Biography: Jöns Jacob Berzelius
 Data1: Beryllium
 Data1: Lead
 Data1: Praseodymium
 Equation: Boyle's Law
 Glossary: Double Electron Capture
 Glossary: Electron Capture
 Glossary: Magnetic Ordering
 Production: Radon
 
remarkable (4)
 Biography: Lise Meitner
 Biography: Pierre Jules César Janssen
 Biography: Robert Wilhelm Bunsen
 On This Day... 27 March
 
remarkably (1)
 Biography: Henry Cavendish
 
remarked (1)
 Biography: Robert Wilhelm Bunsen
 
remarried (1)
 Biography: Jöns Jacob Berzelius
 
remedies (1)
 Data1: Zinc
 
remedy (1)
 Data1: Sodium
 
remelting (1)
 Country: Outer space
 
remembered (4)
 Biography: Jöns Jacob Berzelius
 Biography: Per Teodor Cleve
 Biography: Robert Wilhelm Bunsen
 Biography: Walter Noddack
 
reminded (1)
 Data1: Vanadium
 
reminiscent (1)
 Biography: Walter Noddack
 
remnant (1)
 Data1: Zinc
 
remnants (2)
 Data1: Californium
 Data1: Zinc
 
remote (2)
 Country: United States of America
 Production: Uranium
 
remotely (1)
 Production: Lanthanum
 
removal (5)
 Compounds: Sulfur
 Data1: Polonium
 Data1: Samarium
 Glossary: Alkali Metal
 Production: Hydrogen
 
remove (16)
 Compounds: Calcium
 Compounds: Fluorine
 Compounds: Lithium
 Compounds: Nitrogen
 Compounds: Sodium
 Data1: Caesium
 Data1: Manganese
 Data1: Terbium
 Glossary: Desiccant
 Glossary: Elecron Work Function
 Glossary: Ionization energy
 Glossary: Ionization Potential
 Production: Iron
 Production: Technetium
 Production: Uranium
 Production: Zinc
 
removed (17)
 Biography: Per Teodor Cleve
 Biography: Sir Humphry Davy
 Compounds: Aluminium
 Compounds: Magnesium
 Compounds: Nitrogen
 Compounds: Oxygen
 Data1: Argon
 Data1: Holmium
 Data1: Lanthanum
 Data1: Praseodymium
 Data1: Radium
 Data1: Rhodium
 Data1: Thulium
 Glossary: Ionization Potential
 Glossary: Temperature
 Production: Iron
 Production: Lead
 
removes (1)
 Compounds: Sodium
 
removing (8)
 Compounds: Zinc
 Data1: Argon
 Data1: Cerium
 Data1: Manganese
 Data1: Neodymium
 Data1: Thulium
 Glossary: Temperature
 Production: Zinc
 
remsen (1)
 On This Day... 4 April
 
ren (1)
 On This Day... 9 January
 
renaissance (1)
 Biography: Julius Caesar Scaliger
 
renal (1)
 Compounds: Lanthanum
 
renamed (3)
 Biography: Charles Hatchett
 Data1: Erbium
 Data1: Vanadium
 
render (1)
 Production: Ruthenium
 
rendered (4)
 Biography: Emilio Gino Segre
 On This Day... 15 December
 On This Day... 27 March
 Production: Uranium
 
rendering (1)
 Compounds: Aluminium
 
renders (5)
 Reactions: Germanium
 Reactions: Hafnium
 Reactions: Lead
 Reactions: Titanium
 Reactions: Zirconium
 
renij (1)
 Names: Rhenium
 
renio (1)
 Names: Rhenium
 
renowned (1)
 Data1: Tantalum
 
rensen (1)
 On This Day... 9 January
 
reo2 (1)
 Reactions: Rhenium
 
reo3 (1)
 Reactions: Rhenium
 
reo4 (1)
 Reactions: Rhenium
 
reorganized (1)
 Biography: Frederick Soddy
 
reparations (1)
 Production: Gold
 
repeal (1)
 Biography: Joseph Priestley
 
repeat (1)
 Data1: Nobelium
 
repeated (4)
 Data1: Hafnium
 Data1: Technetium
 Glossary: Brinell Hardness
 On This Day... 7 February
 
repeatedly (1)
 Data1: Silicon
 
repeating (2)
 Glossary: Amorphous
 Glossary: Molecule
 
repellents (1)
 Compounds: Silicon
 
repels (1)
 Compounds: Zinc
 
repetiteur (1)
 Biography: Louis Jacques Thenard
 
replace (4)
 Compounds: Aluminium
 Compounds: Hafnium
 Data1: Praseodymium
 On This Day... 27 September
 
replaced (14)
 Biography: Antoine-Laurent de Lavoisier
 Compounds: Barium
 Compounds: Neodymium
 Data1: Hydrogen
 Data1: Iridium
 Data1: Molybdenum
 Data1: Palladium
 Data1: Selenium
 Data1: Tantalum
 Data1: Tin
 Glossary: Energy Levels
 Isotope: Cobalt
 Production: Aluminium
 Reactions: Carbon
 
replacement (9)
 Biography: Michael Faraday
 Compounds: Silicon
 Compounds: Sodium
 Compounds: Sulfur
 Data1: Bismuth
 Data1: Hydrogen
 Data1: Osmium
 Data1: Titanium
 Isotope: Cobalt
 
replacing (4)
 Compounds: Potassium
 Data1: Germanium
 Data1: Praseodymium
 Data1: Radium
 
replenished (1)
 Data1: Helium
 
replicate (1)
 Data1: Technetium
 
reply (1)
 Biography: Michael Faraday
 
report (1)
 Data1: Nobelium
 
reported (24)
 Allotrope: Carbon
 Allotrope: Sulfur
 Biography: Baron Axel Fredrik Cronstedt
 Biography: William Hyde Wollaston
 Compounds: Krypton
 Data1: Francium
 Data1: Lawrencium
 Data1: Nobelium
 Data1: Protactinium
 Data1: Rhenium
 Data1: Seaborgium
 Data1: Technetium
 Data1: Thulium
 Data1: Titanium
 Data1: Ununhexium
 Data1: Ununpentium
 Data1: Ununquadium
 Data1: Ununtrium
 On This Day... 24 January
 On This Day... 26 April
 On This Day... 26 January
 On This Day... 30 October
 On This Day... 8 July
 Production: Aluminium
 
reportedly (3)
 Data1: Copper
 Data1: Dubnium
 Data1: Rutherfordium
 
reports (20)
 Data1: Gold
 Data1: Neon
 Glossary: Thermal Conductivity
 Production: Antimony
 Production: Arsenic
 Production: Bismuth
 Production: Cadmium
 Production: Cobalt
 Production: Copper
 Production: Iodine
 Production: Iron
 Production: Mercury
 Production: Palladium
 Production: Platinum
 Production: Silver
 Production: Strontium
 Production: Tungsten
 Production: Zinc
 Production: Zirconium
 Reactions: Xenon
 
repository (1)
 Biography: Joseph Priestley
 
repr (1)
 Biography: Enrico Fermi
 
represent (5)
 Document: The Transition Metals (Groups 3 to 12)
 Glossary: Electron Volt
 Glossary: Periodic Table
 Glossary: Wavefunction
 Isotope: Hydrogen
 
representation (2)
 Document: Understanding Electron Configuration Tables
 Glossary: pH
 
representative (2)
 Data1: Mercury
 Equation: Boyle's Law
 
represented (4)
 Biography: Louis Jacques Thenard
 Data1: Germanium
 Glossary: Energy Levels
 Glossary: Oxidation State
 
representing (6)
 Data1: Manganese
 Document: Understanding Electron Configuration Tables
 Glossary: Electron
 Glossary: Neutron
 Glossary: Positron
 Glossary: Proton
 
represents (7)
 Data1: Nitrogen
 Document: Understanding Electron Configuration Tables
 Glossary: Atomic Mass
 Glossary: Energy Levels
 Glossary: pH
 Isotope: Potassium
 Production: Aluminium
 
reprocessed (2)
 Production: Plutonium
 Production: Rhodium
 
reprocessing (4)
 Isotope: Iodine
 Isotope: Krypton
 Production: Rhodium
 Production: Technetium
 
reproduce (3)
 Data1: Germanium
 Data1: Rutherfordium
 Data1: Ununoctium
 
reproduced (2)
 Biography: Ferdinand Frederic Henri Moissan
 Data1: Hydrogen
 
reproducible (2)
 Biography: Ida Eva Tacke Noddack
 Compounds: Zinc
 
reproducing (1)
 On This Day... 16 August
 
reproduction (2)
 Data1: Scandium
 On This Day... 16 August
 
reproductive (1)
 Data1: Arsenic
 
republic (21)
 Biography: Julius Caesar Scaliger
 Biography: Pierre Curie
 Country: Czech Republic
 Country: Democratic People's Republic of Korea
 Country: Democratic Republic of Congo
 Country: Dominican Republic
 Country: Republic of Korea
 Data1: Barium
 Data1: Beryllium
 Data1: Carbon
 Data1: Niobium
 Data1: Protactinium
 Data1: Tantalum
 Data1: Uranium
 Production: Aluminium
 Production: Carbon
 Production: Cobalt
 Production: Niobium
 Production: Protactinium
 Production: Radium
 Production: Tantalum
 
repulsion (1)
 On This Day... 14 September
 
repulsive (1)
 Glossary: van der Waals radius
 
reputable (2)
 Data1: Ununpentium
 Data1: Ununtrium
 
reputation (5)
 Biography: Albert Ghiorso
 Biography: Clemens Alexander Winkler
 Biography: Ida Eva Tacke Noddack
 Biography: Julius Caesar Scaliger
 Biography: Sir Humphry Davy
 
reputed (1)
 Production: Aluminium
 
request (1)
 Biography: Louis Jacques Thenard
 
require (18)
 Compounds: Copper
 Compounds: Gadolinium
 Compounds: Indium
 Compounds: Selenium
 Compounds: Sodium
 Compounds: Uranium
 Country: Outer space
 Data1: Aluminium
 Data1: Beryllium
 Data1: Boron
 Data1: Iridium
 Document: The Halogens (Group 17)
 Glossary: Temperature
 Glossary: Young's Modulus
 Production: Gold
 Production: Technetium
 Reactions: Calcium
 Reactions: Silicon
 
required (26)
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Robert Wilhelm Bunsen
 Compounds: Cobalt
 Compounds: Iodine
 Compounds: Lithium
 Data1: Hydrogen
 Data1: Iodine
 Data1: Iron
 Data1: Magnesium
 Data1: Mercury
 Data1: Molybdenum
 Data1: Oxygen
 Data1: Radon
 Data1: Selenium
 Data1: Titanium
 Equation: Boyle's Law
 Glossary: Alkali Metal
 Glossary: Endothermic
 Glossary: Enthalpy Change of Fusion (Heat of Fusion)
 Glossary: Enthalpy Change of Vapourisation
 Glossary: Ionization energy
 Glossary: Ionization Potential
 Glossary: Specific heat
 Glossary: Temperature
 Production: Hydrogen
 Production: Technetium
 
requires (8)
 Data1: Germanium
 Data1: Polonium
 Glossary: Alkali Metal
 Glossary: Endothermic
 Isotope: Cobalt
 Production: Technetium
 Production: Zinc
 Reactions: Titanium
 
requiring (6)
 Country: South Africa
 Data1: Lithium
 Data1: Phosphorus
 Data1: Titanium
 Glossary: Neutrino
 Isotope: Iridium
 
res2 (1)
 Country: Russia
 
rescued (1)
 Data1: Samarium
 
research (65)
 Allotrope: Carbon
 Biography: Antoine-Laurent de Lavoisier
 Biography: Arthur Jeffrey Dempster
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Emilio Gino Segre
 Biography: Franz-Joseph Muller Freiherr von Reichenstein
 Biography: Frederick Soddy
 Biography: Gottfried Münzenberg
 Biography: Institute for Heavy Ion Research (GSI)
 Biography: Irene Joliot-Curie
 Biography: John Dalton
 Biography: Joseph Louis Gay-Lussac
 Biography: Louis Jacques Thenard
 Biography: Peter Armbruster
 Biography: Philip Hauge Abelson
 Biography: Pierre Curie
 Biography: Robert Wilhelm Bunsen
 Biography: Sir William Crookes
 Biography: Sir William Ramsay
 Compounds: Helium
 Compounds: Radon
 Compounds: Thallium
 Country: Outer space
 Data1: Argon
 Data1: Berkelium
 Data1: Bismuth
 Data1: Bohrium
 Data1: Caesium
 Data1: Californium
 Data1: Darmstadtium
 Data1: Dubnium
 Data1: Francium
 Data1: Hassium
 Data1: Helium
 Data1: Hydrogen
 Data1: Indium
 Data1: Iodine
 Data1: Meitnerium
 Data1: Plutonium
 Data1: Promethium
 Data1: Protactinium
 Data1: Rubidium
 Data1: Rutherfordium
 Data1: Seaborgium
 Data1: Selenium
 Data1: Thallium
 Data1: Titanium
 Data1: Ununhexium
 Data1: Ununoctium
 Data1: Ununpentium
 Data1: Ununquadium
 Data1: Ununtrium
 Isotope: Aluminium
 Isotope: Helium
 On This Day... 13 November
 On This Day... 14 January
 On This Day... 14 June
 On This Day... 14 September
 On This Day... 16 February
 On This Day... 20 January
 On This Day... 23 March
 On This Day... 26 May
 On This Day... 30 April
 On This Day... 4 August
 Production: Technetium
 
researched (3)
 Compounds: Sodium
 On This Day... 27 February
 On This Day... 8 August
 
researcher (89)
 Data1: Thulium
 Data1: Ununoctium
 On This Day... 1 May
 On This Day... 1 October
 On This Day... 10 January
 On This Day... 11 August
 On This Day... 11 February
 On This Day... 11 June
 On This Day... 11 September
 On This Day... 12 August
 On This Day... 12 February
 On This Day... 12 July
 On This Day... 13 July
 On This Day... 13 June
 On This Day... 14 April
 On This Day... 15 August
 On This Day... 15 December
 On This Day... 16 June
 On This Day... 16 March
 On This Day... 16 November
 On This Day... 16 September
 On This Day... 17 April
 On This Day... 17 December
 On This Day... 18 July
 On This Day... 19 July
 On This Day... 19 June
 On This Day... 19 March
 On This Day... 2 December
 On This Day... 2 July
 On This Day... 2 March
 On This Day... 2 November
 On This Day... 20 January
 On This Day... 20 June
 On This Day... 20 May
 On This Day... 21 March
 On This Day... 21 October
 On This Day... 21 September
 On This Day... 22 April
 On This Day... 22 February
 On This Day... 22 June
 On This Day... 22 May
 On This Day... 23 April
 On This Day... 23 August
 On This Day... 23 January
 On This Day... 23 March
 On This Day... 23 May
 On This Day... 23 November
 On This Day... 23 September
 On This Day... 24 June
 On This Day... 24 March
 On This Day... 24 October
 On This Day... 25 July
 On This Day... 26 March
 On This Day... 26 May
 On This Day... 26 November
 On This Day... 27 December
 On This Day... 27 June
 On This Day... 27 March
 On This Day... 27 May
 On This Day... 27 November
 On This Day... 27 October
 On This Day... 28 February
 On This Day... 28 June
 On This Day... 29 August
 On This Day... 29 March
 On This Day... 3 December
 On This Day... 3 February
 On This Day... 3 September
 On This Day... 30 January
 On This Day... 30 October
 On This Day... 31 August
 On This Day... 31 December
 On This Day... 31 January
 On This Day... 4 January
 On This Day... 5 December
 On This Day... 5 July
 On This Day... 5 November
 On This Day... 6 April
 On This Day... 6 February
 On This Day... 6 July
 On This Day... 6 June
 On This Day... 7 January
 On This Day... 7 June
 On This Day... 7 September
 On This Day... 8 May
 On This Day... 9 January
 On This Day... 9 June
 On This Day... 9 November
 On This Day... 9 September
 
researchers (18)
 Biography: Marguerite Catherine Perey
 Compounds: Argon
 Data1: Argon
 Data1: Bismuth
 Data1: Boron
 Data1: Californium
 Data1: Dubnium
 Data1: Fluorine
 Data1: Gallium
 Data1: Lawrencium
 Data1: Nobelium
 Data1: Rutherfordium
 Data1: Tantalum
 Data1: Technetium
 Data1: Ununhexium
 Isotope: Bismuth
 Isotope: Helium
 Production: Fluorine
 
researches (6)
 Biography: Bernard Courtois
 Biography: Henry Cavendish
 Biography: Karl Wilhelm Scheele
 Biography: Louis Jacques Thenard
 Biography: Morris Travers
 On This Day... 13 August
 
researching (1)
 On This Day... 3 December
 
resemblance (1)
 Data1: Bismuth
 
resemble (3)
 Document: The Lanthanoid Series
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 
resembles (5)
 Allotrope: Phosphorus
 Data1: Antimony
 Data1: Europium
 Data1: Scandium
 Data1: Thallium
 
resembling (2)
 Data1: Barium
 Data1: Helium
 
reserve (5)
 Country: United States of America
 Data1: Osmium
 Production: Bromine
 Production: Germanium
 Production: Osmium
 
reserved (2)
 Data1: Neodymium
 Data1: Technetium
 
reservers (1)
 Data1: Beryllium
 
reserves (35)
 Compounds: Carbon
 Country: Australia
 Country: Bolivia
 Country: Botswana
 Country: Brazil
 Country: Canada
 Country: Chile
 Country: China
 Country: Democratic Republic of Congo
 Country: India
 Country: Malaysia
 Country: Mexico
 Country: Norway
 Country: Russia
 Country: South Africa
 Country: Turkey
 Country: United States of America
 Data1: Aluminium
 Data1: Antimony
 Data1: Chromium
 Data1: Manganese
 Data1: Niobium
 Data1: Osmium
 Data1: Plutonium
 Data1: Thulium
 Production: Boron
 Production: Bromine
 Production: Carbon
 Production: Gallium
 Production: Helium
 Production: Niobium
 Production: Osmium
 Production: Thorium
 Production: Titanium
 Production: Uranium
 
reside (1)
 Document: Understanding Electron Configuration Tables
 
resided (1)
 Biography: Michael Faraday
 
residents (1)
 Data1: Neodymium
 
resides (1)
 Data1: Neodymium
 
residual (1)
 Data1: Rubidium
 
residue (5)
 Compounds: Sodium
 Data1: Iridium
 Data1: Krypton
 Data1: Osmium
 Data1: Xenon
 
residues (9)
 Country: Australia
 Country: China
 Country: Kazakhstan
 Country: Russia
 Data1: Ruthenium
 Data1: Thallium
 Production: Indium
 Production: Scandium
 Production: Xenon
 
resigned (2)
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Louis Jacques Thenard
 
resin (2)
 Allotrope: Carbon
 On This Day... 22 March
 
resinate (1)
 Compounds: Copper
 
resinous (1)
 On This Day... 14 September
 
resins (1)
 Compounds: Sulfur
 
resist (3)
 Data1: Titanium
 Glossary: Alloy
 Glossary: Vickers Hardness
 
resistance (24)
 Compounds: Boron
 Compounds: Cadmium
 Compounds: Copper
 Compounds: Palladium
 Compounds: Rhenium
 Compounds: Silicon
 Compounds: Titanium
 Compounds: Zirconium
 Data1: Indium
 Data1: Iridium
 Data1: Lanthanum
 Data1: Nickel
 Data1: Phosphorus
 Data1: Ruthenium
 Data1: Samarium
 Data1: Tantalum
 Data1: Titanium
 Data1: Tungsten
 Glossary: Bulk Modulus
 Glossary: Electrical Resistivity
 Glossary: Moh's Scale of Hardness
 Glossary: Solid
 Glossary: Superconducting temperature
 Glossary: Viscosity
 
resistant (21)
 Allotrope: Carbon
 Compounds: Chromium
 Compounds: Neodymium
 Compounds: Phosphorus
 Compounds: Plutonium
 Compounds: Silicon
 Compounds: Titanium
 Compounds: Tungsten
 Compounds: Zinc
 Compounds: Zirconium
 Data1: Aluminium
 Data1: Boron
 Data1: Cerium
 Data1: Iridium
 Data1: Titanium
 Data1: Tungsten
 Document: The Halogens (Group 17)
 Glossary: Refractory
 Reactions: Chromium
 Reactions: Niobium
 Reactions: Vanadium
 
resisting (1)
 Data1: Niobium
 
resistivity (115)
 Allotrope: Phosphorus
 Compounds: Silicon
 Compounds: Tin
 Data2: Actinium
 Data2: Aluminium
 Data2: Americium
 Data2: Antimony
 Data2: Argon
 Data2: Arsenic
 Data2: Astatine
 Data2: Barium
 Data2: Berkelium
 Data2: Beryllium
 Data2: Bismuth
 Data2: Bohrium
 Data2: Boron
 Data2: Bromine
 Data2: Cadmium
 Data2: Caesium
 Data2: Calcium
 Data2: Californium
 Data2: Carbon
 Data2: Cerium
 Data2: Chlorine
 Data2: Chromium
 Data2: Cobalt
 Data2: Copper
 Data2: Curium
 Data2: Darmstadtium
 Data2: Dysprosium
 Data2: Einsteinium
 Data2: Erbium
 Data2: Europium
 Data2: Fermium
 Data2: Fluorine
 Data2: Francium
 Data2: Gadolinium
 Data2: Gallium
 Data2: Germanium
 Data2: Gold
 Data2: Hafnium
 Data2: Hassium
 Data2: Helium
 Data2: Holmium
 Data2: Hydrogen
 Data2: Indium
 Data2: Iodine
 Data2: Iridium
 Data2: Iron
 Data2: Krypton
 Data2: Lanthanum
 Data2: Lawrencium
 Data2: Lead
 Data2: Lithium
 Data2: Lutetium
 Data2: Magnesium
 Data2: Manganese
 Data2: Meitnerium
 Data2: Mendelevium
 Data2: Mercury
 Data2: Molybdenum
 Data2: Neodymium
 Data2: Neon
 Data2: Neptunium
 Data2: Nickel
 Data2: Niobium
 Data2: Nitrogen
 Data2: Nobelium
 Data2: Osmium
 Data2: Oxygen
 Data2: Palladium
 Data2: Phosphorus
 Data2: Platinum
 Data2: Plutonium
 Data2: Polonium
 Data2: Potassium
 Data2: Praseodymium
 Data2: Promethium
 Data2: Protactinium
 Data2: Radium
 Data2: Radon
 Data2: Rhenium
 Data2: Rhodium
 Data2: Roentgenium
 Data2: Rubidium
 Data2: Ruthenium
 Data2: Rutherfordium
 Data2: Samarium
 Data2: Scandium
 Data2: Seaborgium
 Data2: Selenium
 Data2: Silicon
 Data2: Silver
 Data2: Sodium
 Data2: Strontium
 Data2: Sulfur
 Data2: Tantalum
 Data2: Technetium
 Data2: Tellurium
 Data2: Terbium
 Data2: Thallium
 Data2: Thorium
 Data2: Thulium
 Data2: Tin
 Data2: Titanium
 Data2: Tungsten
 Data2: Uranium
 Data2: Vanadium
 Data2: Xenon
 Data2: Ytterbium
 Data2: Yttrium
 Data2: Zinc
 Data2: Zirconium
 Glossary: Electrical Conductivity
 Glossary: Electrical Resistivity
 
resistors (2)
 Compounds: Tantalum
 Data1: Tellurium
 
resists (3)
 Data1: Fluorine
 Data1: Tin
 Production: Fluorine
 
resolution (1)
 Compounds: Phosphorus
 
resolved (4)
 Data1: Dubnium
 Data1: Meitnerium
 Data1: Niobium
 Data1: Rutherfordium
 
resonance (5)
 Data1: Gadolinium
 Data1: Helium
 Data1: Titanium
 Glossary: Aromatic
 On This Day... 28 February
 
resonant (1)
 Data1: Xenon
 
resource (3)
 Country: Spain
 Data1: Copper
 Production: Rhodium
 
resources (12)
 Compounds: Carbon
 Country: Russia
 Country: South Africa
 Country: Ukraine
 Data1: Gold
 On This Day... 4 December
 Production: Carbon
 Production: Manganese
 Production: Nickel
 Production: Tantalum
 Production: Uranium
 Production: Vanadium
 
respect (5)
 Biography: Jöns Jacob Berzelius
 Data1: Bismuth
 Data1: Boron
 Glossary: Alloy
 Glossary: Non-Metals
 
respected (1)
 Biography: Joseph Louis Gay-Lussac
 
respective (2)
 Biography: Irene Joliot-Curie
 Reactions: Platinum
 
respectively (8)
 Biography: Robert Wilhelm Bunsen
 Compounds: Vanadium
 Data1: Hydrogen
 Isotope: Darmstadtium
 Reactions: Beryllium
 Reactions: Selenium
 Reactions: Tungsten
 Reactions: Uranium
 
respiration (6)
 Biography: Antoine-Laurent de Lavoisier
 Compounds: Sodium
 Data1: Helium
 Data1: Oxygen
 Data1: Sulfur
 Production: Oxygen
 
respiratory (6)
 Data1: Antimony
 Data1: Bromine
 Data1: Chlorine
 Data1: Copper
 Data1: Palladium
 Data1: Tungsten
 
respond (1)
 Compounds: Nitrogen
 
responded (1)
 Compounds: Arsenic
 
responds (1)
 Glossary: Plasma
 
response (7)
 Biography: Louis Jacques Thenard
 Glossary: Bulk Modulus
 Glossary: Magnetic Ordering
 Glossary: Magnetic Susceptibility (Mass)
 Glossary: Magnetic Susceptibility (Molar)
 Glossary: Shear Modulus
 Glossary: Thermal Expansion
 
responsible (9)
 Biography: Adair Crawford
 Compounds: Chlorine
 Compounds: Oxygen
 Compounds: Potassium
 Compounds: Sodium
 Country: Outer space
 Data1: Argon
 Glossary: Magnetic Ordering
 Isotope: Aluminium
 
rest (11)
 Biography: Hans Christian Oersted
 Biography: Jöns Jacob Berzelius
 Biography: Karl Wilhelm Scheele
 Biography: Sir Humphry Davy
 Compounds: Iron
 Compounds: Sodium
 Data1: Mercury
 Data1: Scandium
 Glossary: Electron Volt
 Glossary: Photon
 Glossary: Temperature
 
restoration (1)
 On This Day... 31 December
 
restorations (1)
 Data1: Gold
 
restorative (1)
 Data1: Gold
 
restored (1)
 Biography: Dmitriy Ivanovich Mendeleyev
 
restoring (1)
 Compounds: Sodium
 
restrict (1)
 Biography: Pierre Curie
 
restricted (3)
 Country: United States of America
 Data1: Mercury
 Reactions: Carbon
 
rests (1)
 Biography: Martin Heinrich Klaproth
 
result (47)
 Allotrope: Sulfur
 Biography: Antoine-Laurent de Lavoisier
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Julius Caesar Scaliger
 Compounds: Samarium
 Compounds: Silver
 Compounds: Sulfur
 Country: Australia
 Country: Outer space
 Country: South Africa
 Data1: Aluminium
 Data1: Arsenic
 Data1: Copper
 Data1: Europium
 Data1: Fluorine
 Data1: Helium
 Data1: Holmium
 Data1: Lead
 Data1: Praseodymium
 Data1: Radon
 Data1: Seaborgium
 Data1: Tellurium
 Data1: Xenon
 Document: The Actinoid Series
 Equation: Boyle's Law
 Glossary: Actinides
 Glossary: Actinoids
 Glossary: Electron Capture
 Glossary: Group
 Glossary: Isotope
 Glossary: Magnetic Ordering
 Glossary: Thermal Expansion
 Isotope: Argon
 Isotope: Iodine
 Production: Francium
 Production: Helium
 Production: Technetium
 Reactions: Caesium
 Reactions: Cobalt
 Reactions: Hydrogen
 Reactions: Iron
 Reactions: Krypton
 Reactions: Potassium
 Reactions: Rhenium
 Reactions: Rubidium
 Reactions: Sodium
 Reactions: Technetium
 
resultant (1)
 Biography: Robert Wilhelm Bunsen
 
resulted (10)
 Biography: Albert Ghiorso
 Biography: Henry Cavendish
 Biography: John William Strutt Rayleigh
 Country: South Africa
 Data1: Arsenic
 Data1: Mercury
 Data1: Phosphorus
 Data1: Rhenium
 Data1: Rutherfordium
 Production: Uranium
 
resulting (28)
 Biography: Lise Meitner
 Biography: Robert Wilhelm Bunsen
 Compounds: Boron
 Compounds: Rhenium
 Country: Outer space
 Data1: Lanthanum
 Data1: Nitrogen
 Data1: Rubidium
 Data1: Scandium
 Data1: Ununpentium
 Data1: Ununtrium
 Data1: Zinc
 Document: The Alkali (Group 1) Metals
 Glossary: Alloy
 Glossary: Aqua regia
 Glossary: Ionic bonds
 Glossary: Magnetic Ordering
 Isotope: Hydrogen
 Production: Helium
 Production: Hydrogen
 Production: Nickel
 Production: Uranium
 Production: Zinc
 Reactions: Caesium
 Reactions: Carbon
 Reactions: Lithium
 Reactions: Potassium
 Reactions: Rubidium
 
results (25)
 Allotrope: Phosphorus
 Biography: Clemens Alexander Winkler
 Biography: Hans Christian Oersted
 Biography: Ida Eva Tacke Noddack
 Biography: Joseph Louis Gay-Lussac
 Biography: Lise Meitner
 Biography: Robert Wilhelm Bunsen
 Biography: Sir Humphry Davy
 Compounds: Silicon
 Data1: Bohrium
 Data1: Hydrogen
 Data1: Thulium
 Data1: Ununhexium
 Data1: Ununoctium
 Data1: Ununpentium
 Data1: Ununtrium
 Glossary: Base
 Glossary: Convection
 On This Day... 13 April
 Production: Technetium
 Production: Tellurium
 Production: Tin
 Reactions: Chromium
 Reactions: Palladium
 Reactions: Platinum
 
resumably (2)
 Data1: Darmstadtium
 Data1: Dubnium
 
resumed (1)
 Biography: Jöns Jacob Berzelius
 
retain (5)
 Data1: Iron
 Data1: Nobelium
 Glossary: Magnetic Ordering
 Glossary: Molecule
 Glossary: Refractory
 
retained (4)
 Data1: Actinium
 Data1: Terbium
 Data1: Yttrium
 Glossary: Air
 
retains (3)
 Allotrope: Carbon
 Compounds: Cobalt
 Data1: Rhenium
 
retardant (7)
 Compounds: Antimony
 Compounds: Boron
 Compounds: Bromine
 Compounds: Sodium
 Data1: Antimony
 Data1: Bromine
 Data1: Sodium
 
retardation (1)
 Data1: Lead
 
retention (4)
 Compounds: Magnesium
 Compounds: Tin
 Compounds: Titanium
 Data1: Calcium
 
retired (2)
 Biography: Gottfried Münzenberg
 Biography: Lise Meitner
 
retirement (3)
 Biography: Andre Louis Debierne
 Biography: Jean Charles Galissard de Marignac
 Biography: Robert Wilhelm Bunsen
 
retort (2)
 Data1: Phosphorus
 Production: Zinc
 
retorting (1)
 On This Day... 17 November
 
retracted (1)
 Data1: Ununoctium
 
retraction (1)
 Data1: Ununhexium
 
retrieve (1)
 Biography: Robert Wilhelm Bunsen
 
return (7)
 Biography: Emilio Gino Segre
 Biography: Enrico Fermi
 Biography: Hans Christian Oersted
 Biography: John William Strutt Rayleigh
 Biography: Robert Wilhelm Bunsen
 Biography: Sir Humphry Davy
 Data1: Platinum
 
returned (9)
 Biography: Bernard Courtois
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Emilio Gino Segre
 Biography: George Charles de Hevesy
 Biography: Irene Joliot-Curie
 Biography: Lise Meitner
 Biography: Robert Wilhelm Bunsen
 Biography: Sir William Crookes
 Data1: Technetium
 
returning (3)
 Biography: Otto Hahn
 Glossary: Isometric Transition
 Production: Thorium
 
returns (1)
 Compounds: Sodium
 
reusable (1)
 Isotope: Actinium
 
reuslts (1)
 Biography: Albert Ghiorso
 
rev (2)
 Biography: Frederick Soddy
 Biography: Joseph Priestley
 
reveal (1)
 Compounds: Silver
 
revealed (2)
 Biography: Morris Travers
 Glossary: X-Rays
 
reverend (2)
 Country: Oceans / Seas
 Production: Gold
 
reverse (1)
 Glossary: pH
 
reversed (1)
 Data1: Terbium
 
reversible (2)
 Data1: Lanthanum
 Production: Hydrogen
 
reversibly (1)
 Compounds: Vanadium
 
revert (1)
 Allotrope: Selenium
 
reverted (1)
 Data1: Lutetium
 
review (1)
 Data1: Ununhexium
 
reviewed (2)
 Data1: Ununpentium
 Data1: Ununtrium
 
revised (2)
 Biography: Jöns Jacob Berzelius
 Data1: Francium
 
revisions (1)
 Biography: Jöns Jacob Berzelius
 
revolution (5)
 Biography: Antoine-Laurent de Lavoisier
 Biography: Joseph Louis Gay-Lussac
 Biography: Joseph Priestley
 Data1: Europium
 Data1: Iron
 
revolutionary (1)
 Biography: Antoine-Laurent de Lavoisier
 
revolutionized (1)
 Data1: Europium
 
revolve (1)
 Glossary: Atom
 
reward (2)
 Biography: Joseph Louis Gay-Lussac
 Biography: Julius Caesar Scaliger
 
rewards (1)
 Biography: Gottfried Münzenberg
 
rf (2)
 Data1: Rutherfordium
 Isotope: Rutherfordium
 
rf+4 (1)
 Data2: Rutherfordium
 
rf260 (1)
 Data1: Rutherfordium
 
rg (2)
 Data1: Roentgenium
 Isotope: Roentgenium
 
rgen (1)
 On This Day... 16 February
 
rgyi (1)
 On This Day... 16 September
 
rh (9)
 Atomic data: Rhodium
 Data1: Rhodium
 Data2: Rhodium
 Isotope: Palladium
 Isotope: Rhodium
 Isotope: Ruthenium
 Production: Rhodium
 Reactions: Rhodium
 Spectrum: Rhodium
 
rh+ (1)
 Atomic data: Rhodium
 
rh+1 (1)
 Data2: Rhodium
 
rh+2 (1)
 Data2: Rhodium
 
rh+3 (1)
 Data2: Rhodium
 
rh+4 (1)
 Data2: Rhodium
 
rh+5 (1)
 Data2: Rhodium
 
rh+6 (1)
 Data2: Rhodium
 
rh0 (1)
 Data2: Rhodium
 
rh2o3 (1)
 Reactions: Rhodium
 
rh3+ (1)
 Reactions: Rhodium
 
rhabdophane (1)
 Production: Cerium
 
rhbr3 (1)
 Reactions: Rhodium
 
rhcl3 (1)
 Reactions: Rhodium
 
rhcl63 (1)
 Reactions: Rhodium
 
rheniite (1)
 Country: Russia
 
rhenium (19)
 Atomic data: Rhenium
 Biography: Ida Eva Tacke Noddack
 Biography: Walter Noddack
 Compounds: Boron
 Compounds: Rhenium
 Country: Chile
 Country: Russia
 Data1: Francium
 Data1: Rhenium
 Data1: Technetium
 Data2: Rhenium
 Document: Abundance of the Elements in the Solar System
 Isotope: Rhenium
 MAC data: Rhenium
 Names: Rhenium
 Production: Rhenium
 Reactions: Bohrium
 Reactions: Rhenium
 Spectrum: Rhenium
 
rhetoric (1)
 Biography: Julius Caesar Scaliger
 
rheumatic (1)
 Biography: Julius Caesar Scaliger
 
rheumatoid (1)
 Compounds: Gold
 
rhf3 (1)
 Reactions: Rhodium
 
rhf5 (1)
 Reactions: Platinum
 
rhf6 (1)
 Reactions: Rhodium
 
rhines (1)
 Data1: Rhenium
 
rho2 (1)
 Reactions: Rhodium
 
rho2+ (1)
 Reactions: Rhodium
 
rho42 (1)
 Reactions: Rhodium
 
rhodium (21)
 Atomic data: Rhodium
 Biography: William Hyde Wollaston
 Compounds: Rhodium
 Country: Canada
 Country: Russia
 Country: South Africa
 Country: United States of America
 Data1: Osmium
 Data1: Rhodium
 Data1: Technetium
 Data2: Rhodium
 Document: Abundance of the Elements in the Solar System
 Glossary: Carcinogen
 Isotope: Rhodium
 MAC data: Rhodium
 Names: Rhodium
 Production: Palladium
 Production: Rhodium
 Reactions: Meitnerium
 Reactions: Rhodium
 Spectrum: Rhodium
 
rhodochrosite (2)
 Data1: Manganese
 Production: Manganese
 
rhodon (1)
 Data1: Rhodium
 
rhombohedral (6)
 Allotrope: Boron
 Allotrope: Phosphorus
 Allotrope: Selenium
 Allotrope: Sulfur
 Data2: Boron
 Data2: Mercury
 
rhubarb (1)
 Glossary: Acid
 
ri (1)
 Isotope: Hydrogen
 
ribbon (2)
 Data1: Magnesium
 Data1: Rhenium
 
ribonuclease (1)
 On This Day... 4 September
 
ric (1)
 On This Day... 19 March
 
rica (1)
 Country: Costa Rica
 
rice (4)
 Allotrope: Carbon
 Compounds: Sodium
 On This Day... 20 May
 On This Day... 21 July
 
rich (23)
 Biography: Sir Humphry Davy
 Compounds: Radium
 Country: Canada
 Country: Israel
 Country: Jordan
 Data1: Cobalt
 Data1: Europium
 Data1: Neodymium
 Data1: Platinum
 Data1: Radon
 Data1: Technetium
 Glossary: Doubly Magic
 Isotope: Magnesium
 Isotope: Oxygen
 Production: Caesium
 Production: Chromium
 Production: Gold
 Production: Iron
 Production: Polonium
 Production: Radon
 Production: Selenium
 Production: Thallium
 Production: Uranium
 
richard (7)
 Allotrope: Carbon
 Biography: Antoine-Laurent de Lavoisier
 On This Day... 13 August
 On This Day... 23 August
 On This Day... 3 January
 On This Day... 6 June
 On This Day... 7 May
 
richards (1)
 On This Day... 31 January
 
richardson (1)
 Data1: Helium
 
richer (4)
 Country: United States of America
 Data1: Europium
 Production: Radium
 Production: Terbium
 
richest (3)
 Country: Australia
 Production: Mercury
 Production: Terbium
 
richter (6)
 Biography: Ferdinand Reich
 Biography: Hieronymous Theodor Richter
 Biography: Robert Wilhelm Bunsen
 Data1: Indium
 On This Day... 10 March
 On This Day... 21 November
 
riddle (1)
 Production: Nickel
 
ridge (5)
 Biography: Philip Hauge Abelson
 Data1: Einsteinium
 Data1: Plutonium
 Data1: Promethium
 Production: Einsteinium
 
ridiculed (1)
 Biography: Pierre Jules César Janssen
 
riding (1)
 Biography: Smithson Tennant
 
riebau (1)
 Biography: Michael Faraday
 
rifle (1)
 Compounds: Molybdenum
 
rift (1)
 Country: Democratic Republic of Congo
 
rigging (1)
 Data1: Titanium
 
right (7)
 Biography: Robert Wilhelm Bunsen
 Compounds: Calcium
 Data1: Nitrogen
 Document: Understanding Electron Configuration Tables
 Glossary: Metalloids
 On This Day... 19 April
 Reactions: Uranium
 
rights (2)
 Production: Gold
 Production: Tantalum
 
rigid (2)
 Biography: Jöns Jacob Berzelius
 On This Day... 3 October
 
rigidity (3)
 Compounds: Silicon
 Data1: Beryllium
 Glossary: Solid
 
riken (1)
 Isotope: Hydrogen
 
ring (7)
 Glossary: Aliphatic
 Glossary: Aromatic
 Glossary: X-Rays
 On This Day... 23 January
 On This Day... 27 June
 On This Day... 7 September
 Production: Sulfur
 
rings (4)
 Allotrope: Carbon
 Allotrope: Sulfur
 Biography: Joseph Priestley
 Compounds: Tungsten
 
rinmann (1)
 Compounds: Cobalt
 
rio (3)
 Biography: Emilio Gino Segre
 Data1: Vanadium
 On This Day... 10 November
 
rionium (1)
 Data1: Vanadium
 
ripe (1)
 Compounds: Sodium
 
rise (7)
 Biography: Julius Caesar Scaliger
 Compounds: Plutonium
 Country: Algeria
 Country: Qatar
 Glossary: Emission Spectrum
 Production: Lead
 Reactions: Plutonium
 
risen (1)
 Production: Indium
 
rises (1)
 Glossary: Enthalpy Change of Fusion (Heat of Fusion)
 
rising (2)
 Glossary: Convection
 Production: Copper
 
risk (9)
 Compounds: Carbon
 Data1: Argon
 Data1: Cobalt
 Data1: Lithium
 Data1: Plutonium
 Data1: Selenium
 Glossary: Alpha Decay
 Production: Radon
 Reactions: Iron
 
risks (4)
 Data1: Nitrogen
 Data1: Radium
 Data1: Radon
 Production: Radon
 
ritter (1)
 On This Day... 16 December
 
rituals (1)
 Data1: Gold
 
river (6)
 Data1: Osmium
 Data1: Rhodium
 On This Day... 18 January
 Production: Osmium
 Production: Rhodium
 Production: Thulium
 
rivers (2)
 Data1: Mercury
 Production: Selenium
 
rlda (92)
 Atomic data: Actinium
 Atomic data: Aluminium
 Atomic data: Antimony
 Atomic data: Argon
 Atomic data: Arsenic
 Atomic data: Astatine
 Atomic data: Barium
 Atomic data: Beryllium
 Atomic data: Bismuth
 Atomic data: Boron
 Atomic data: Bromine
 Atomic data: Cadmium
 Atomic data: Caesium
 Atomic data: Calcium
 Atomic data: Carbon
 Atomic data: Cerium
 Atomic data: Chlorine
 Atomic data: Chromium
 Atomic data: Cobalt
 Atomic data: Copper
 Atomic data: Dysprosium
 Atomic data: Erbium
 Atomic data: Europium
 Atomic data: Fluorine
 Atomic data: Francium
 Atomic data: Gadolinium
 Atomic data: Gallium
 Atomic data: Germanium
 Atomic data: Gold
 Atomic data: Hafnium
 Atomic data: Helium
 Atomic data: Holmium
 Atomic data: Hydrogen
 Atomic data: Indium
 Atomic data: Iodine
 Atomic data: Iridium
 Atomic data: Iron
 Atomic data: Krypton
 Atomic data: Lanthanum
 Atomic data: Lead
 Atomic data: Lithium
 Atomic data: Lutetium
 Atomic data: Magnesium
 Atomic data: Manganese
 Atomic data: Mercury
 Atomic data: Molybdenum
 Atomic data: Neodymium
 Atomic data: Neon
 Atomic data: Nickel
 Atomic data: Niobium
 Atomic data: Nitrogen
 Atomic data: Osmium
 Atomic data: Oxygen
 Atomic data: Palladium
 Atomic data: Phosphorus
 Atomic data: Platinum
 Atomic data: Polonium
 Atomic data: Potassium
 Atomic data: Praseodymium
 Atomic data: Promethium
 Atomic data: Protactinium
 Atomic data: Radium
 Atomic data: Radon
 Atomic data: Rhenium
 Atomic data: Rhodium
 Atomic data: Rubidium
 Atomic data: Ruthenium
 Atomic data: Samarium
 Atomic data: Scandium
 Atomic data: Selenium
 Atomic data: Silicon
 Atomic data: Silver
 Atomic data: Sodium
 Atomic data: Strontium
 Atomic data: Sulfur
 Atomic data: Tantalum
 Atomic data: Technetium
 Atomic data: Tellurium
 Atomic data: Terbium
 Atomic data: Thallium
 Atomic data: Thorium
 Atomic data: Thulium
 Atomic data: Tin
 Atomic data: Titanium
 Atomic data: Tungsten
 Atomic data: Uranium
 Atomic data: Vanadium
 Atomic data: Xenon
 Atomic data: Ytterbium
 Atomic data: Yttrium
 Atomic data: Zinc
 Atomic data: Zirconium
 
rm (7)
 Data2: Molybdenum
 Data2: Osmium
 Data2: Rhenium
 Data2: Rhodium
 Data2: Ruthenium
 Data2: Technetium
 Data2: Tungsten
 
rms (1)
 Equation: Root mean square (RMS) velocity of gas molecules
 
rn (43)
 Atomic data: Actinium
 Atomic data: Francium
 Atomic data: Protactinium
 Atomic data: Radium
 Atomic data: Radon
 Atomic data: Thorium
 Atomic data: Uranium
 Data1: Radon
 Data2: Actinium
 Data2: Americium
 Data2: Berkelium
 Data2: Bohrium
 Data2: Californium
 Data2: Curium
 Data2: Darmstadtium
 Data2: Dubnium
 Data2: Einsteinium
 Data2: Fermium
 Data2: Francium
 Data2: Hassium
 Data2: Lawrencium
 Data2: Meitnerium
 Data2: Mendelevium
 Data2: Neptunium
 Data2: Nobelium
 Data2: Plutonium
 Data2: Protactinium
 Data2: Radium
 Data2: Roentgenium
 Data2: Rutherfordium
 Data2: Seaborgium
 Data2: Thorium
 Data2: Ununbium
 Data2: Ununhexium
 Data2: Ununoctium
 Data2: Ununpentium
 Data2: Ununquadium
 Data2: Ununseptium
 Data2: Ununtrium
 Data2: Uranium
 Isotope: Radium
 Isotope: Radon
 Spectrum: Radon
 
rn+ (1)
 Atomic data: Radon
 
rn+2 (1)
 Data2: Radon
 
rn0 (1)
 Data2: Radon
 
rnf6 (1)
 Reactions: Radon
 
road (3)
 Biography: Jöns Jacob Berzelius
 Glossary: Spontaneous Fission
 Production: Iron
 
roadbuilding (1)
 Compounds: Calcium
 
roads (1)
 Production: Uranium
 
roald (1)
 On This Day... 18 July
 
roam (1)
 Compounds: Silver
 
roasted (2)
 Production: Cadmium
 Production: Zinc
 
roaster (1)
 Production: Rhenium
 
roasting (3)
 Data1: Arsenic
 Production: Arsenic
 Production: Thallium
 
robert (29)
 Biography: Gustav Robert Kirchhoff
 Biography: Hennig Brand
 Biography: Robert Wilhelm Bunsen
 Biography: Sir William Crookes
 Compounds: Nitrogen
 Data1: Caesium
 Data1: Helium
 Data1: Hydrogen
 Data1: Lawrencium
 Data1: Lithium
 Data1: Radon
 Data1: Rubidium
 On This Day... 1 November
 On This Day... 10 May
 On This Day... 12 July
 On This Day... 12 March
 On This Day... 17 April
 On This Day... 18 July
 On This Day... 19 October
 On This Day... 22 March
 On This Day... 23 August
 On This Day... 25 January
 On This Day... 3 June
 On This Day... 31 March
 On This Day... 31 May
 On This Day... 5 August
 On This Day... 7 January
 On This Day... 7 July
 On This Day... 7 June
 
robertson (1)
 On This Day... 17 April
 
robiquet (1)
 On This Day... 13 January
 
rocca (1)
 Biography: Julius Caesar Scaliger
 
rock (26)
 Biography: Robert Wilhelm Bunsen
 Compounds: Calcium
 Compounds: Carbon
 Compounds: Chlorine
 Country: Canada
 Country: Outer space
 Country: Russia
 Country: United Kingdom
 Data1: Cerium
 Data1: Germanium
 Data1: Phosphorus
 Data1: Yttrium
 Data1: Zirconium
 Production: Bromine
 Production: Carbon
 Production: Gold
 Production: Lead
 Production: Mercury
 Production: Phosphorus
 Production: Rhodium
 Production: Silicon
 Production: Strontium
 Production: Technetium
 Production: Uranium
 Production: Yttrium
 Production: Zirconium
 
rockefeller (1)
 Biography: Emilio Gino Segre
 
rocket (13)
 Allotrope: Carbon
 Allotrope: Oxygen
 Compounds: Nitrogen
 Compounds: Potassium
 Compounds: Strontium
 Country: United States of America
 Data1: Boron
 Data1: Caesium
 Data1: Lithium
 Data1: Niobium
 Data1: Oxygen
 Data1: Tungsten
 On This Day... 7 July
 
rockets (3)
 Compounds: Nitrogen
 Data1: Aluminium
 Data1: Hydrogen
 
rocks (24)
 Biography: Baron Axel Fredrik Cronstedt
 Biography: Johan Gadolin
 Biography: Philip Hauge Abelson
 Biography: Robert Wilhelm Bunsen
 Compounds: Phosphorus
 Country: Australia
 Country: Outer space
 Data1: Rubidium
 Data1: Silicon
 Data1: Thorium
 Data1: Uranium
 Data1: Zirconium
 Glossary: Cosmogenic isotope
 Isotope: Iodine
 Isotope: Osmium
 On This Day... 31 August
 Production: Calcium
 Production: Copper
 Production: Lithium
 Production: Nickel
 Production: Niobium
 Production: Thorium
 Production: Titanium
 Production: Zirconium
 
rod (6)
 Data1: Indium
 Data1: Iron
 Data1: Lead
 Data1: Rhenium
 Data1: Vanadium
 Data1: Zirconium
 
rode (1)
 Allotrope: Carbon
 
rodenticide (2)
 Compounds: Arsenic
 Compounds: Copper
 
rodenticides (1)
 Compounds: Lead
 
rodents (1)
 Compounds: Phosphorus
 
rodij (1)
 Names: Rhodium
 
rodio (1)
 Names: Rhodium
 
rodium (1)
 Names: Rhodium
 
rods (13)
 Compounds: Hafnium
 Data1: Dysprosium
 Data1: Hafnium
 Data1: Holmium
 Data1: Niobium
 Data1: Samarium
 Data1: Technetium
 Glossary: Alkali Metal (alkaline-earth metals)
 Isotope: Boron
 Isotope: Krypton
 Isotope: Uranium
 Production: Neptunium
 Production: Technetium
 
roentgen (1)
 Glossary: X-Rays
 
roentgenio (2)
 Names: Darmstadtium
 Names: Roentgenium
 
roentgenium (13)
 Atomic data: Roentgenium
 Biography: Gottfried Münzenberg
 Biography: Institute for Heavy Ion Research (GSI)
 Compounds: Roentgenium
 Data1: Roentgenium
 Data2: Roentgenium
 Isotope: Roentgenium
 MAC data: Roentgenium
 Names: Roentgenium
 On This Day... 8 December
 Production: Roentgenium
 Reactions: Roentgenium
 Spectrum: Roentgenium
 
roger (1)
 On This Day... 24 October
 
rohs (1)
 Data1: Lead
 
role (22)
 Biography: Antoine-Laurent de Lavoisier
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Gottfried Münzenberg
 Country: Outer space
 Data1: Chlorine
 Data1: Holmium
 Data1: Lutetium
 Data1: Molybdenum
 Data1: Nitrogen
 Data1: Praseodymium
 Data1: Rhodium
 Data1: Ruthenium
 Data1: Tungsten
 Document: The Halogens (Group 17)
 Glossary: Electrical Resistivity
 Glossary: Temperature
 On This Day... 12 June
 On This Day... 22 May
 Production: Cadmium
 Production: Copper
 Production: Selenium
 Production: Technetium
 
roles (1)
 Data1: Gold
 
roll (1)
 Data1: Germanium
 
roller (1)
 Glossary: Brinell Hardness
 
rollers (1)
 Compounds: Silicon
 
roman (7)
 Data1: Copper
 Data1: Lead
 Data1: Mercury
 Data1: Uranium
 Data1: Zinc
 Glossary: Group
 Production: Lead
 
romance (1)
 Data1: Tin
 
romania (4)
 Biography: Franz-Joseph Muller Freiherr von Reichenstein
 Country: Romania
 Country: Russia
 Data1: Tellurium
 
romans (5)
 Data1: Aluminium
 Data1: Calcium
 Data1: Copper
 Data1: Manganese
 Data1: Mercury
 
rome (4)
 Biography: Emilio Gino Segre
 Biography: Enrico Fermi
 Biography: Sir Humphry Davy
 Data1: Boron
 
ronald (3)
 On This Day... 13 May
 On This Day... 9 May
 On This Day... 9 November
 
rontgen (2)
 Biography: Gottfried Münzenberg
 Data1: Roentgenium
 
rontgenium (1)
 Names: Roentgenium
 
roofing (1)
 Data1: Lead
 
roofs (1)
 Compounds: Zinc
 
room (42)
 Allotrope: Arsenic
 Allotrope: Carbon
 Allotrope: Oxygen
 Allotrope: Phosphorus
 Allotrope: Sulfur
 Allotrope: Ytterbium
 Compounds: Nitrogen
 Compounds: Silicon
 Compounds: Zirconium
 Data1: Americium
 Data1: Argon
 Data1: Caesium
 Data1: Gadolinium
 Data1: Gallium
 Data1: Indium
 Data1: Lithium
 Data1: Palladium
 Data1: Plutonium
 Data1: Radon
 Data1: Thallium
 Data1: Uranium
 Data1: Xenon
 Document: The Alkaline Earth Metals (Group 2)
 Document: The Lanthanoid Series
 Document: The Transition Metals (Groups 3 to 12)
 Glossary: Alkali Metal (alkaline-earth metals)
 Glossary: Enthalpy Change of Fusion (Heat of Fusion)
 Glossary: Halogens
 Glossary: Pyrophoric
 Glossary: Semiconductor
 Reactions: Bromine
 Reactions: Chlorine
 Reactions: Chromium
 Reactions: Iodine
 Reactions: Krypton
 Reactions: Lead
 Reactions: Molybdenum
 Reactions: Niobium
 Reactions: Phosphorus
 Reactions: Silicon
 Reactions: Tantalum
 Reactions: Tungsten
 
rooster (1)
 Data1: Gallium
 
root (3)
 Data1: Lead
 Equation: Graham's Law
 Equation: Root mean square (RMS) velocity of gas molecules
 
rooted (1)
 Production: Uranium
 
roots (4)
 Biography: Robert Wilhelm Bunsen
 Compounds: Phosphorus
 Data1: Oxygen
 Document: The Halogens (Group 17)
 
roques (1)
 Biography: Julius Caesar Scaliger
 
rosalind (1)
 On This Day... 25 July
 
roscoe (4)
 Biography: Robert Wilhelm Bunsen
 Data1: Vanadium
 On This Day... 16 June
 On This Day... 7 January
 
rose (8)
 Biography: Jöns Jacob Berzelius
 Biography: William Hyde Wollaston
 Country: China
 Country: Spain
 Data1: Erbium
 Data1: Iodine
 Data1: Niobium
 Data1: Rhodium
 
roses (1)
 Compounds: Magnesium
 
ross (1)
 On This Day... 13 May
 
rosy (1)
 Data1: Rhodium
 
rotate (1)
 Biography: Sir William Crookes
 
rotating (1)
 On This Day... 2 May
 
rotation (3)
 Biography: William Hyde Wollaston
 Country: Outer space
 Glossary: Temperature
 
rotational (1)
 Glossary: Temperature
 
rotten (1)
 Data1: Sulfur
 
rotting (1)
 Compounds: Sulfur
 
rouen (1)
 Biography: Louis Nicolas Vauquelin
 
rouge (1)
 Compounds: Iron
 
roughly (4)
 Biography: Lise Meitner
 Country: Outer space
 Data1: Beryllium
 Glossary: Air
 
roult (1)
 On This Day... 10 April
 
round (1)
 Data1: Beryllium
 
roundup (1)
 Data1: Phosphorus
 
route (1)
 Compounds: Praseodymium
 
routed (1)
 Production: Radon
 
routes (1)
 Production: Hydrogen
 
routine (1)
 Data1: Lithium
 
routinely (2)
 Isotope: Barium
 Production: Gallium
 
rovere (1)
 Biography: Julius Caesar Scaliger
 
rovers (1)
 Isotope: Polonium
 
row (4)
 Glossary: Actinides
 Glossary: Actinoids
 Glossary: Lanthanides (old name)
 Glossary: Lanthanoids
 
rowland (2)
 On This Day... 28 June
 On This Day... 3 December
 
rows (1)
 Document: Understanding Electron Configuration Tables
 
roy (1)
 On This Day... 9 July
 
royal (17)
 Biography: Carl Gustav Mosander
 Biography: Charles Hatchett
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Karl Wilhelm Scheele
 Biography: Michael Faraday
 Biography: Robert Wilhelm Bunsen
 Biography: Sir William Crookes
 Data1: Iodine
 Data1: Osmium
 Data1: Platinum
 Data1: Titanium
 Glossary: Aqua regia
 On This Day... 15 January
 On This Day... 15 November
 On This Day... 26 November
 On This Day... 6 October
 Reactions: Gold
 
royalty (1)
 Data1: Gold
 
royds (1)
 Data1: Helium
 
rrkm (1)
 On This Day... 21 July
 
rt (1)
 On This Day... 14 October
 
rtg (1)
 Isotope: Strontium
 
rtgs (1)
 Isotope: Strontium
 
rtut (1)
 Names: Mercury
 
ru (13)
 Atomic data: Ruthenium
 Compounds: Ruthenium
 Data1: Ruthenium
 Data2: Ruthenium
 Isotope: Molybdenum
 Isotope: Rhodium
 Isotope: Ruthenium
 Isotope: Technetium
 Production: Rhodium
 Production: Ruthenium
 Production: Technetium
 Reactions: Ruthenium
 Spectrum: Ruthenium
 
ru+ (1)
 Atomic data: Ruthenium
 
ru+1 (1)
 Data2: Ruthenium
 
ru+2 (1)
 Data2: Ruthenium
 
ru+3 (1)
 Data2: Ruthenium
 
ru+4 (1)
 Data2: Ruthenium
 
ru+5 (1)
 Data2: Ruthenium
 
ru+6 (1)
 Data2: Ruthenium
 
ru+7 (1)
 Data2: Ruthenium
 
ru+8 (1)
 Data2: Ruthenium
 
ru0 (1)
 Data2: Ruthenium
 
ru2+ (1)
 Reactions: Ruthenium
 
rubbed (2)
 Biography: Sir Humphry Davy
 Data1: Arsenic
 
rubber (16)
 Compounds: Lead
 Compounds: Magnesium
 Compounds: Oxygen
 Compounds: Selenium
 Compounds: Zinc
 Data1: Argon
 Data1: Bismuth
 Data1: Molybdenum
 Data1: Selenium
 Data1: Sulfur
 Data1: Tellurium
 Data1: Titanium
 Glossary: Poisson Ratio
 On This Day... 11 February
 On This Day... 19 January
 On This Day... 5 February
 
rubbery (1)
 Compounds: Silicon
 
ruben (1)
 Isotope: Carbon
 
rubidij (1)
 Names: Rubidium
 
rubidio (1)
 Names: Rubidium
 
rubidium (21)
 Atomic data: Rubidium
 Biography: Gustav Robert Kirchhoff
 Biography: Robert Wilhelm Bunsen
 Compounds: Rubidium
 Data1: Rubidium
 Data2: Arsenic
 Data2: Mercury
 Data2: Rubidium
 Document: Abundance of the Elements in the Solar System
 Document: Chemical makeup of the human body
 Document: The Alkali (Group 1) Metals
 Glossary: Alkali Metal
 Glossary: Electron Capture
 Isotope: Rubidium
 MAC data: Rubidium
 Names: Rubidium
 On This Day... 22 February
 Production: Rubidium
 Production: Tellurium
 Reactions: Rubidium
 Spectrum: Rubidium
 
rubidus (2)
 Biography: Robert Wilhelm Bunsen
 Data1: Rubidium
 
rubies (3)
 Data1: Aluminium
 Data1: Chromium
 Data1: Titanium
 
rubin (1)
 On This Day... 27 August
 
ruby (4)
 Data1: Aluminium
 Data1: Chromium
 Data1: Silver
 On This Day... 11 July
 
rucl3 (1)
 Reactions: Ruthenium
 
rucl5 (1)
 Reactions: Ruthenium
 
rudkjobing (1)
 Biography: Hans Christian Oersted
 
rudolph (2)
 On This Day... 2 January
 On This Day... 21 July
 
ruf5 (1)
 Reactions: Platinum
 
ruf6 (1)
 Reactions: Ruthenium
 
ruins (2)
 Biography: Jöns Jacob Berzelius
 Data1: Cobalt
 
rule (6)
 Data1: Seaborgium
 On This Day... 11 February
 On This Day... 14 January
 On This Day... 24 September
 On This Day... 28 December
 Production: Holmium
 
rules (3)
 On This Day... 18 July
 On This Day... 26 March
 On This Day... 4 February
 
ruling (2)
 Data1: Arsenic
 Data1: Seaborgium
 
rumford (2)
 On This Day... 20 January
 On This Day... 26 March
 
run (2)
 Production: Hydrogen
 Production: Iron
 
runaway (1)
 Data1: Sodium
 
runge (1)
 Biography: Robert Wilhelm Bunsen
 
running (4)
 Biography: Bernard Courtois
 Biography: Irene Joliot-Curie
 Compounds: Molybdenum
 Production: Zinc
 
runoff (1)
 Production: Selenium
 
ruo2 (1)
 Reactions: Ruthenium
 
ruo4 (2)
 Data1: Ruthenium
 Reactions: Ruthenium
 
ruo42 (1)
 Reactions: Ruthenium
 
rus (1)
 Data1: Ruthenium
 
rush (2)
 Country: South Africa
 On This Day... 24 January
 
rushes (1)
 Data1: Gold
 
russell (1)
 Data1: Neptunium
 
russia (57)
 Allotrope: Carbon
 Biography: Dmitriy Ivanovich Mendeleyev
 Country: Algeria
 Country: Canada
 Country: China
 Country: Germany
 Country: Hungary
 Country: Japan
 Country: Kazakhstan
 Country: Russia
 Country: Slovakia
 Country: Ukraine
 Country: United Kingdom
 Country: United States of America
 Data1: Aluminium
 Data1: Beryllium
 Data1: Bromine
 Data1: Carbon
 Data1: Copper
 Data1: Dubnium
 Data1: Iron
 Data1: Lawrencium
 Data1: Magnesium
 Data1: Manganese
 Data1: Mercury
 Data1: Nickel
 Data1: Niobium
 Data1: Palladium
 Data1: Platinum
 Data1: Ruthenium
 Data1: Scandium
 Data1: Selenium
 Data1: Strontium
 Data1: Thorium
 Data1: Tungsten
 Data1: Ununhexium
 Data1: Ununoctium
 Data1: Ununpentium
 Data1: Ununquadium
 Data1: Ununtrium
 Data1: Yttrium
 Production: Aluminium
 Production: Carbon
 Production: Chromium
 Production: Cobalt
 Production: Helium
 Production: Molybdenum
 Production: Nickel
 Production: Niobium
 Production: Palladium
 Production: Phosphorus
 Production: Platinum
 Production: Rhenium
 Production: Rhodium
 Production: Sulfur
 Production: Tungsten
 Production: Uranium
 
russian (23)
 Biography: Dmitriy Ivanovich Mendeleyev
 Biography: Karl Klaus
 Data1: Dubnium
 Data1: Helium
 Data1: Nobelium
 Data1: Polonium
 Data1: Ruthenium
 Data1: Samarium
 Data1: Technetium
 Glossary: Periodic Table
 Isotope: Hydrogen
 On This Day... 15 September
 On This Day... 16 March
 On This Day... 2 March
 On This Day... 21 May
 On This Day... 22 January
 On This Day... 30 July
 On This Day... 4 March
 On This Day... 8 February
 On This Day... 9 July
 Production: Carbon
 Production: Molybdenum
 Production: Nickel
 
russians (1)
 Data1: Rutherfordium
 
rust (4)
 Compounds: Iron
 Compounds: Sulfur
 Data1: Manganese
 Data1: Tin
 
rusting (3)
 Biography: Antoine-Laurent de Lavoisier
 Data1: Zinc
 Reactions: Iron
 
rutenij (1)
 Names: Ruthenium
 
rutenio (1)
 Names: Ruthenium
 
rutenium (1)
 Names: Ruthenium
 
ruthefordij (1)
 Names: Rutherfordium
 
ruthenia (1)
 Data1: Ruthenium
 
ruthenium (17)
 Atomic data: Ruthenium
 Biography: Karl Klaus
 Compounds: Ruthenium
 Data1: Ruthenium
 Data1: Technetium
 Data2: Ruthenium
 Document: Abundance of the Elements in the Solar System
 Glossary: Spontaneous Fission
 Isotope: Ruthenium
 MAC data: Ruthenium
 Names: Ruthenium
 On This Day... 22 January
 Production: Ruthenium
 Production: Technetium
 Reactions: Hassium
 Reactions: Ruthenium
 Spectrum: Ruthenium
 
rutherford (10)
 Biography: Andre Louis Debierne
 Biography: Daniel Rutherford
 Biography: Frederick Soddy
 Biography: Otto Hahn
 Data1: Helium
 Data1: Nitrogen
 Data1: Rutherfordium
 Glossary: Proton
 On This Day... 3 November
 On This Day... 30 August
 
rutherfordio (1)
 Names: Rutherfordium
 
rutherfordium (13)
 Atomic data: Rutherfordium
 Biography: Albert Ghiorso
 Compounds: Rutherfordium
 Data1: Rutherfordium
 Data1: Seaborgium
 Data2: Rutherfordium
 Glossary: Spontaneous Fission
 Isotope: Rutherfordium
 MAC data: Rutherfordium
 Names: Rutherfordium
 Production: Rutherfordium
 Reactions: Rutherfordium
 Spectrum: Rutherfordium
 
rutile (12)
 Country: Australia
 Country: Brazil
 Country: India
 Country: Malaysia
 Country: Sierra Leone
 Country: South Africa
 Country: Sri Lanka
 Country: Ukraine
 Country: Vietnam
 Data1: Titanium
 Production: Titanium
 Production: Zirconium
 
rutt (1)
 Biography: Joseph Priestley
 
rwanda (1)
 Country: Rwanda
 
ryoji (1)
 On This Day... 1 June