Alphabetic list of Chemical Elements (T-U)

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A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z

Name: Tantalum
Symbol: Ta
Atomic Number: 73
Atomic Weight: 180.948
Group: Transition metals
Date Discovered: 1802
Discovered By: Anders Ekeberg

Name: Technetium
Symbol: Tc
Atomic Number: 43
Atomic Weight: (98)
Group: Transition metals
Date Discovered: 1937
Discovered By: Carlo Perrier and Emilio Segrè

Name: Tellurium
Symbol: Te
Atomic Number: 52
Atomic Weight: 127.60
Group: Nonmetals
Date Discovered: 1782
Discovered By: Franz Müller

Name: Terbium
Symbol: Tb
Atomic Number: 65
Atomic Weight: 158.9253
Group: Lanthanide
Date Discovered: series 1843
Discovered By: Carl Mosander

Name: Thallium
Symbol: Tl
Atomic Number: 81
Atomic Weight: 204.3833
Group: Other metals
Date Discovered: 1861
Discovered By: William Crookes (isolated by William Crookes and Claude August Lamy, independently of each other, in 1862

Name: Thorium
Symbol: Th
Atomic Number: 90
Atomic Weight: 232.0381
Group: Actinide
Date Discovered: series 1828
Discovered By: Jöns Berzelius

Name: Thulium
Symbol: Tm
Atomic Number: 69
Atomic Weight: 168.9342
Group: Lanthanide
Date Discovered: series 1879
Discovered By: Per Cleve

Name: Tin
Symbol: Sn
Atomic Number: 50
Atomic Weight: 118.711
Group: Other metals
Date Discovered: prehistoric
Discovered By: unknown

Name: Titanium
Symbol: Ti
Atomic Number: 22
Atomic Weight: 47.867
Group: Transition metals
Date Discovered: 1790
Discovered By: William Gregor

Name: Tungsten
Symbol: W
Atomic Number: 74
Atomic Weight: 183.84
Group: Transition metals
Date Discovered: 1783
Discovered By: isolated by Juan José Elhuyar and Fausto Elhuyar

Name: Ununbium
Symbol: Uub
Atomic Number: 112
Atomic Weight: (277)
Group: Transition metals
Date Discovered: 1996
Discovered By: team at the Heavy-Ion Research Laboratory, Darmstadt, Germany

Name: Ununhexium
Symbol: Uuh
Atomic Number: 116
Atomic Weight: (292)
Group: Other metals
Date Discovered: 2000
Discovered By: team at the Joint Institute for Nuclear Research, Dubna, Russia

Name: Ununquadium
Symbol: Uuq
Atomic Number: 114
Atomic Weight: (285)
Group: Other metals
Date Discovered: 1998
Discovered By: team at the Joint Institute for Nuclear Research, Dubna, Russia

Name: Unununium
Symbol: Uuu
Atomic Number: 111
Atomic Weight: (272)
Group: Transition metals
Date Discovered: 1994
Discovered By: team at the Heavy-Ion Research Laboratory, Darmstadt, Germany

Name: Uranium
Symbol: U
Atomic Number: 92
Atomic Weight: 238.0289
Group: Actinide
Date Discovered: series 1789
Discovered By: Martin Klaproth (isolated by Eugène Péligot 1841)

A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z

Alphabetic list of Chemical Elements (Q-R-S)

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A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z

Name: Radium
Symbol: Ra
Atomic Number: 88
Atomic Weight: (226)
Group: Alkaline earth metals
Date Discovered: 1898
Discovered By: Marie Curie

Name: Radon
Symbol: Rn
Atomic Number: 86
Atomic Weight: (222)
Group: Noble gases
Date Discovered: 1900
Discovered By: Friedrich Dorn

Name: Rhenium
Symbol: Re
Atomic Number: 75
Atomic Weight: 186.207
Group: Transition metals
Date Discovered: 1925
Discovered By: Walter Noddack, Ida Tacke, and Otto Berg

Name: Rhodium
Symbol: Rh
Atomic Number: 45
Atomic Weight: 102.9055
Group: Transition metals
Date Discovered: 1804
Discovered By: William Wollaston

Name: Rubidium
Symbol: Rb
Atomic Number: 37
Atomic Weight: 85.4678
Group: Alkali metals
Date Discovered: 1861
Discovered By: Robert Bunsen and Gustav Kirchhoff

Name: Ruthenium
Symbol: Ru
Atomic Number: 44
Atomic Weight: 101.07
Group: Transition metals
Date Discovered: 1827
Discovered By: G. W. Osann (isolated by Karl Klaus 1844)

Name: Rutherfordium
Symbol: Rf
Atomic Number: 104
Atomic Weight: (261)
Group: Transition metals
Date Discovered: 1969
Discovered By: claimed by U.S. scientist Albert Ghiorso and coworkers (disputed by Soviet workers)

Name: Samarium
Symbol: Sm
Atomic Number: 62
Atomic Weight: 150.36
Group: Lanthanide
Date Discovered: series 1879
Discovered By: Paul Lecoq de Boisbaudran

Name: Scandium
Symbol: Sc
Atomic Number: 21
Atomic Weight: 44.9559
Group: Transition metals
Date Discovered: 1876
Discovered By: Lars Nilson

Name: Seaborgium
Symbol: Sg
Atomic Number: 106
Atomic Weight: (266)
Group: Transition metals
Date Discovered: 1974
Discovered By: claimed by Georgii Flerov and coworkers, and independently by Albert Ghiorso and coworkers

Name: Selenium
Symbol: Se
Atomic Number: 34
Atomic Weight: 78.96
Group: Nonmetals
Date Discovered: 1817
Discovered By: Jöns Berzelius

Name: Silicon
Symbol: Si
Atomic Number: 14
Atomic Weight: 28.0855
Group: Nonmetals
Date Discovered: 1823
Discovered By: Johan Arfwedson

Name: Silver
Symbol: Ag
Atomic Number: 47
Atomic Weight: 107.8682
Group: Transition metals
Date Discovered: prehistoric
Discovered By: unknown

Name: Sodium
Symbol: Na
Atomic Number: 11
Atomic Weight: 22.9898
Group: Alkali metals
Date Discovered: 1807
Discovered By: Humphry Davy

Name: Strontium
Symbol: Sr
Atomic Number: 38
Atomic Weight: 87.62
Group: Alkaline earth metals
Date Discovered: 1808
Discovered By: Humphry Davy

Name: Sulfur
Symbol: S
Atomic Number: 16
Atomic Weight: 32.067
Group: Nonmetals
Date Discovered: prehistoric
Discovered By: unknown

A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z

Alphabetic list of Chemical Elements (N-O-P)

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A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z

Name: Neodymium
Symbol: Nd
Atomic Number: 60
Atomic Weight: 144.24
Group: Lanthanide
Date Discovered: series 1885
Discovered By: Carl von Welsbach

Name: Neon
Symbol: Ne
Atomic Number: 10
Atomic Weight: 20.1798
Group: Noble gases
Date Discovered: 1898
Discovered By: William Ramsay and Morris Travers

Name: Neptunium
Symbol: Np
Atomic Number: 93
Atomic Weight: (237)
Group: Actinide
Date Discovered: series 1940
Discovered By: Edwin McMillan and Philip Abelson

Name: Nickel
Symbol: Ni
Atomic Number: 28
Atomic Weight: 58.6934
Group: Transition metals
Date Discovered: 1751
Discovered By: Axel Cronstedt

Name: Niobium
Symbol: Nb
Atomic Number: 41
Atomic Weight: 92.9064
Group: Transition metals
Date Discovered: 1801
Discovered By: Charles Hatchett

Name: Nitrogen
Symbol: N
Atomic Number: 7
Atomic Weight: 14.0067
Group: Nonmetals
Date Discovered: 1772
Discovered By: Daniel Rutherford

Name: Nobelium
Symbol: No
Atomic Number: 102
Atomic Weight: (259)
Group: Actinide
Date Discovered: series 1958
Discovered By: Albert Ghiorso, Torbjørn Sikkeland, J. R. Walton, and Glenn Seaborg

Name: Osmium
Symbol: Os
Atomic Number: 76
Atomic Weight: 190.23
Group: Transition metals
Date Discovered: 1804
Discovered By: Smithson Tennant

Name: Oxygen
Symbol: O
Atomic Number: 8
Atomic Weight: 15.9994
Group: Nonmetals
Date Discovered: 1774
Discovered By: Joseph Priestley and Karl Scheele, independently of each other

Name: Palladium
Symbol: Pd
Atomic Number: 46
Atomic Weight: 106.42
Group: Transition metals
Date Discovered: 1804
Discovered By: William Wollaston

Name: Phosphorus
Symbol: P
Atomic Number: 15
Atomic Weight: 30.9738
Group: Nonmetals
Date Discovered: 1674
Discovered By: Hennig Brand

Name: Platinum
Symbol: Pt
Atomic Number: 78
Atomic Weight: 195.08
Group: Transition metals
Date Discovered: 1557
Discovered By: Julius Scaliger

Name: Plutonium
Symbol: Pu
Atomic Number: 94
Atomic Weight: (244)
Group: Actinide
Date Discovered: series 1940
Discovered By: Glenn Seaborg, Edwin McMillan, Joseph Kennedy, and Arthur Wahl

Name: Polonium
Symbol: Po
Atomic Number: 84
Atomic Weight: (209)
Group: Other metals
Date Discovered: 1898
Discovered By: Marie and Pierre Curie

Name: Potassium
Symbol: K
Atomic Number: 19
Atomic Weight: 39.0983
Group: Alkali metals
Date Discovered: 1807
Discovered By: Humphry Davy

Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Weight: 140.908
Group: Lanthanide
Date Discovered: series 1885
Discovered By: Carl von Welsbach

Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Weight: (145)
Group: Lanthanide
Date Discovered: series 1945
Discovered By: J. A. Marinsky, Lawrence

Name: Protactinium
Symbol: Pa
Atomic Number: 91
Atomic Weight: 231.036
Group: Actinide
Date Discovered: series 1913
Discovered By: Kasimir Fajans and O. Göhring

A-B, C-D, E-F-G-H, I-J-K-L-M, N-O-P, Q-R-S, T-U, V-W-X-Y-Z