Elements Of The Periodic Table

Elements of the Periodic Table Name Symbol Atomic Number Atomic Weight Group Date Discovered Discovered By Actinide series

Actinium

Ac 89 (227)

1899

Aluminum

Al 13 26.9815 Other metals 1824

Americium

Am

Antimony

Sb

Argon

Ar

Arsenic

As

Astatine

At

Barium

Ba

Berkelium

Bk

Beryllium

Be

Bismuth

Bi

Bohrium

Bh

Boron

B

Bromine

Br

Cadmium

Cd

Calcium

Ca

Californium

Cf

Carbon

C

André Debierne

Hans Oersted (also attributed to Friedrich Wöhler 1827) Glenn Seaborg, Ralph James, Actinide 95 243 1944 Leon Morgan, and Albert series Ghiorso 51 121.760 Other metals prehistoric unknown John Rayleigh and William 18 39.948 Noble gases 1894 Ramsay 33 74.9216 Nonmetals prehistoric unknown Dale R. Corson, K. R. 85 (210) Halogens 1940 MacKenzie, and Emilio Segrè Alkaline 56 137.328 1808 Humphry Davy earth metals Glenn Seaborg, Stanley Actinide 97 (247) 1949 Thompson, and Albert series Ghiorso Louis-Nicolas Vauquelin Alkaline (isolated by Friedrich Wöhler 4 9.0122 1798 earth metals and Antoine-AlexandreBrutus Bussy 1828) 83 208.9804 Other metals prehistoric unknown Georgii Flerov and Yuri Transition Oganessian (confirmed by 107 (262) 1976 metals German scientist Peter Armbruster and coworkers) Humphry Davy, and independently by Joseph Gay5 10.81 Nonmetals 1808 Lussac and Louis-Jacques Thénard 35 79.904 Halogens 1826 Antoine-Jérôme Balard Transition 48 112.412 1817 Friedrich Strohmeyer metals Alkaline 20 40.078 1808 Humphry Davy earth metals Glenn Seaborg, Stanley Actinide 98 (251) 1950 Thompson, Kenneth Street, series Jr., and Albert Ghiorso 6 12.011 Nonmetals prehistoric unknown

Cerium

Ce 58 140.115

Cesium

Cs 55 132.9054

Chlorine Chromium Cobalt Copper Curium

1774

Jöns Berzelius and Wilhelm Hisinger, and independently by Martin Klaproth Robert Bunsen and Gustav Kirchhoff Karl Scheele

1797

Louis-Nicolas Vauquelin

1730

Georg Brandt

Lanthanide 1804 series

Alkali metals Cl 17 35.4528 Halogens Transition Cr 24 51.9962 metals Transition Co 27 58.9332 metals Transition Cu 29 63.546 metals Actinide Cm 96 (247) series

1860

prehistoric unknown 1944

Darmstadtium Ds 110 (271)

Transition metals

1994

Dubnium

Db 105 (262)

Transition metals

1970

Dysprosium

Dy 66 162.500

Einsteinium Erbium Europium Fermium

Lanthanide series Actinide Es 99 (252) series Lanthanide Er 68 167.26 series Lanthanide Eu 63 151.966 series Actinide Fm 100 (257) series

Fluorine

F

9

18.9984 Halogens

Francium

Fr

87 (223)

Gadolinium

Gd

Gallium Germanium

Ga Ge

Gold

Au

Hafnium

Hf

Hassium

Hs

Glenn Seaborg, Ralph James, and Albert Ghiorso team at the Heavy-Ion Research Laboratory, Darmstadt, Germany claimed by Albert Ghiorso and coworkers (disputed by Soviet workers)

1886

Paul Lecoq de Boisbaudran

1952

Albert Ghiorso and coworkers

1843

Carl Mosander

1901

Eugène Demarçay

1955

Albert Ghiorso and coworkers

1771

Karl Scheele (isolated by Henri Moissan 1886)

Alkali 1939 Marguérite Perey metals Lanthanide 64 157.25 1886 Paul Lecoq de Boisbaudran series 31 69.723 Other metals 1875 Paul Lecoq de Boisbaudran 32 72.61 Other metals 1886 Clemens Winkler Transition 79 196.9665 prehistoric unknown metals Transition Dirk Coster and Georg von 72 178.49 1913 metals Hevesy Transition Peter Armbruster and 108 (263) 1984 metals coworkers

Helium

Hydrogen

Noble gases 1868 Lanthanide Ho 67 164.9303 1879 series H 1 1.0079 Nonmetals 1766

Indium

In

Iodine

I

Holmium

Iridium Iron

He 2

4.0026

Per Cleve

1811

Henry Cavendish Ferdinand Reich and Hieronymus Richter Bernard Courtois

1804

Smithson Tennant

49 114.818 Other metals 1863

53 126.9045 Halogens Transition Ir 77 192.217 metals Transition Fe 26 55.845 metals

Pierre Janssen

prehistoric unknown

Krypton

Kr 36 83.798

Noble gases 1898

William Ramsay and Morris Travers

Lanthanum

La 57 138.9055

Lanthanide 1839 series

Carl Mosander

Albert Ghiorso, Torbjørn Sikkeland, Almon Larsh, and Robert Latimer Lead Pb 82 207.2 Other metals prehistoric unknown Alkali Lithium Li 3 6.941 1817 Johan Arfwedson metals Georges Urbain and Carl von Transition Lutetium Lu 71 174.967 1907 Welsbach, independently of metals each other Joseph Black (oxide isolated by Humphry Davy 1808; pure Alkaline Magnesium Mg 12 24.3051 1755 form isolated by Antoineearth metals Alexandre-Brutus Bussy 1828) Transition Manganese Mn 25 54.938 1774 Johann Gottlieb Gahn metals Transition Peter Armbruster and Meitnerium Mt 109 (268) 1982 metals coworkers Albert Ghiorso, Bernard G. Actinide Harvey, Gregory Choppin, Mendelevium Md 101 (258) 1955 series Stanley Thompson, and Glenn Seaborg Transition Mercury Hg 80 200.59 prehistoric unknown metals named by Karl Scheele Transition Molybdenum Mo 42 95.94 1781 (isolated by Peter Jacob Hjelm metals 1782) Lanthanide Neodymium Nd 60 144.24 1885 Carl von Welsbach series Lawrencium

Lr

103 (260)

Transition metals

1961

Neon

Ne 10 20.1798 Noble gases 1898

Neptunium

Np 93 (237)

William Ramsay and Morris Travers Edwin McMillan and Philip Abelson

Nitrogen

Actinide series Transition Ni 28 58.6934 metals Transition Nb 41 92.9064 metals N 7 14.0067 Nonmetals

Nobelium

No 102 (259)

Actinide series

1958

Osmium

Os 76 190.23

Transition metals

1804

Smithson Tennant

1774

Joseph Priestley and Karl Scheele, independently of each other

Nickel Niobium

15.9994 Nonmetals

1751

Axel Cronstedt

1801

Charles Hatchett

1772

Daniel Rutherford Albert Ghiorso, Torbjørn Sikkeland, J. R. Walton, and Glenn Seaborg

Oxygen

O

Palladium

Pd 46 106.42

1804

William Wollaston

Phosphorus

P

1674

Hennig Brand

Platinum

Pt

1557

Julius Scaliger

Plutonium

Pu 94 (244)

Polonium

Po 84 (209)

Glenn Seaborg, Edwin McMillan, Joseph Kennedy, and Arthur Wahl Marie and Pierre Curie

Potassium

K

Humphry Davy

Praseodymium Pr

8

1940

Transition metals 15 30.9738 Nonmetals Transition 78 195.08 metals Actinide series

1940

Other metals 1898 Alkali 19 39.0983 1807 metals Lanthanide 59 140.908 1885 series Lanthanide 1945 series

Carl von Welsbach J. A. Marinsky, Lawrence Glendenin, and Charles Coryell Kasimir Fajans and O. Göhring

Promethium

Pm 61 (145)

Protactinium

Pa 91 231.036

1913

Radium

Ra 88

1898

Marie Curie

Radon

Rn 86

1900

Rhenium

Re 75

Friedrich Dorn Walter Noddack, Ida Tacke, and Otto Berg

Rhodium

Rh 45

Rubidium

Rb 37

Actinide series Alkaline (226) earth metals (222) Noble gases Transition 186.207 metals Transition 102.9055 metals Alkali 85.4678 metals

1925 1804

William Wollaston

1861

Robert Bunsen and Gustav Kirchhoff

Ruthenium

Ru 44 101.07

Rutherfordium Rf 104 (261) Samarium Scandium

Transition metals

1827

Transition metals

1969

Lanthanide 1879 series Transition Sc 21 44.9559 1876 metals Sm 62 150.36

Transition metals

Seaborgium

Sg 106 (266)

Selenium Silicon

Se 34 78.96 Nonmetals Si 14 28.0855 Nonmetals Transition Ag 47 107.8682 metals Alkali Na 11 22.9898 metals Alkaline Sr 38 87.62 earth metals S 16 32.067 Nonmetals Transition Ta 73 180.948 metals Transition Tc 43 (98) metals Te 52 127.60 Nonmetals Lanthanide Tb 65 158.9253 series

Silver Sodium Strontium Sulfur Tantalum Technetium Tellurium Terbium Thallium

Tl

Thorium

Th 90 232.0381

Thulium Tin Titanium Tungsten Ununbium

1974 1817 1823

G. W. Osann (isolated by Karl Klaus 1844) claimed by U.S. scientist Albert Ghiorso and coworkers (disputed by Soviet workers) Paul Lecoq de Boisbaudran Lars Nilson claimed by Georgii Flerov and coworkers, and independently by Albert Ghiorso and coworkers Jöns Berzelius Johan Arfwedson

prehistoric unknown 1807

Humphry Davy

1808

Humphry Davy

prehistoric unknown 1802

Anders Ekeberg

1782

Carlo Perrier and Emilio Segrè Franz Müller

1843

Carl Mosander

1937

81 204.3833 Other metals 1861

William Crookes (isolated by William Crookes and Claude August Lamy, independently of each other, in 1862)

Actinide 1828 Jöns Berzelius series Lanthanide Tm 69 168.9342 1879 Per Cleve series Sn 50 118.711 Other metals prehistoric unknown Transition Ti 22 47.867 1790 William Gregor metals Transition isolated by Juan José Elhuyar W 74 183.84 1783 metals and Fausto Elhuyar Uub 112 (277) Transition 1996 team at the Heavy-Ion metals Research Laboratory,

Ununhexium

Uuh 116 (292)

Other metals 2000

Ununoctium

Uuo 118 (294)

Noble gases 2006

Ununpentium Uup 115 (288)

Other metals 2004

Ununquadium Uuq 114 (285)

Other metals 1998

Ununtrium

Other metals 2004

Uut 113 (284)

Roentgenium Rg 111 (272)

Transition metals

Actinide series Transition 23 50.9415 metals

Uranium

U

92 238.0289

Vanadium

V

Xenon

Xe 54 131.29

Ytterbium

Yb 70 173.04

Yttrium

Y

Zinc

Zn 30 65.409

Zirconium

Zr

39 88.906

40 91.224

1994 1789 1801

Noble gases 1898 Lanthanide series Transition metals Transition metals Transition metals

Darmstadt, Germany team at the Joint Institute for Nuclear Research, Dubna, Russia team at the Joint Institute for Nuclear Research, Dubna, Russia team at the Joint Institute for Nuclear Research, Dubna, Russia team at the Joint Institute for Nuclear Research, Dubna, Russia team at the Joint Institute for Nuclear Research, Dubna, Russia team at the Heavy-Ion Research Laboratory, Darmstadt, Germany Martin Klaproth (isolated by Eugène Péligot 1841) Andrés del Rio (disputed), or Nils Sefström 1830 William Ramsay and Morris Travers

1878

Jean Charles de Marignac

1794

Johan Gadolin

prehistoric unknown 1789

Martin Klaproth