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Glossary of the Elements

Atom #

Element Symbol

Element Name

Atomic Weight

Atomic Structure

Discovered Year

Discovered By

1 H Hydrogen 1.00794 1 1766 Henry Cavendish
2 He Helium 4.00260 2 1895 Sir William Ramsey
3 Li Lithium 6.941 2-1 1817 Johann Arfvedson
4 Be Beryllium 9.01218 2-2 1798 Fredrich Wohler
5 B Boron 10.81 2-3 1808 Sir Humphry Davy, J.L Gay-Lussac
6 C Carbon 12.011 2-4 Unknown Unknown
7 N Nitrogen 14.0067 2-5 1772 Daniel Rutherford
8 O Oxygen 15.9994 2-6 1774 Joseph Priestly
9 F Fluorine 18.998403 2-7 1886 Joseph Henri Moissan
10 Ne Neon 20.179 2-8 1898 Sir William Ramsey
11 Na Sodium 22.98977 2-8-1 1807 Sir Humphrey Davy
12 Mg Magnesium 24.305 2-8-2 1808 Sir Humphrey Davy
13 Al Aluminum 26.98154 2-8-3 1825 Hans Christian Oersted
14 Si Silicon 28.0855 2-8-4 1823 Jons Berzelius
15 P Phosphorus 30.97376 2-8-5 1669 Hennig Brand
16 S Sulfur 32.06 2-8-6 Unknown Unknown
17 Cl Chlorine 35.453 2-8-7 1774 Carl Wilhelm Scheele
18 Ar Argon 39.948 2-8-8 1894 Sir William Ramsey
19 K Potassium 39.0983 2-8-8-1 1807 Sir Humphrey Davy
20 Ca Calcium 40.08 2-8-8-2 1808 Sir Humphrey Davy
21 Sc Scandium 44.9559 2-8-9-2 1879 Lars Nilson
22 Ti Titanium 47.88 2-8-10-2 1791 William Gregor
23 V Vanadium 50.9415 2-8-11-2 1830 Nils Sefstrom
24 Cr Chromium 51.996 2-8-13-1 1797 Louis Vauquelin
25 Mn Manganese 54.9380 2-8-13-2 1774 Johann Gahn
26 Fe Iron 55.847 2-8-14-2 Unknown Unknown
27 Co Cobalt 58.9332 2-8-15-2 1737 George Brandt
28 Ni Nickel 58.69 2-8-16-2 1751 Alex Cronstedt
29 Cu Copper 63.546 2-8-18-1 Unknown Unknown
30 Zn Zinc 65.38 2-8-18-2 1746 Andreas Marggraf
31 Ga Gallium 69.72 2-8-18-3 1875 Paul Emile Lecoq de Boisbaudran
32 Ge Germanium 72.59 2-8-18-4 1886 Clemens Winkler
33 As Arsenic 74.9216 2-8-18-5 Unknown Unknown
34 Se Selenium 78.96 2-8-18-6 1817 Jons Berzelius
35 Br Bromine 79.904 2-8-18-7 1826 Antoine J. Balard
36 Kr Krypton 83.80 2-8-18-8 1898 Sir William Ramsey
37 Rb Rubidium 85.4678 2-8-18-8-1 1861 R. Bunsen
38 Sr Strontium 87.62 2-8-18-8-2 1790 A. Crawford
39 Y Yttrium 88.9059 2-8-18-9-2 1794 Johann Gadolin
40 Zr Zirconium 91.22 2-8-18-10-2 1789 Martin Klaproth
41 Nb Niobium 92.9064 2-8-18-12-1 1801 Charles Hatchet
42 Mo Molybdenum 95.94 2-8-18-13-1 1778 Carl Wilhelm Scheele
43 Tc Technetium 98 2-8-18-13-2 1937 Carlo Perrier
44 Ru Ruthenium 101.07 2-8-15-15-1 1844 Karl Klaus
45 Rh Rhodium 102.9055 2-8-18-16-1 1803 William Wollaston
46 Pd Palladium 106.42 2-8-18-18-0 1803 William Wollaston
47 Ag Silver 107.8682 2-8-18-18-1 Unknown Unknown
48 Cd Cadmium 112.41 2-8-18-18-2 1817 Fredrich Stromeyer
49 In Indium 114.82 2-8-18-18-3 1863 Ferdinand Reich
50 Sn Tin 118.69 2-8-18-1-4 Unknown Unknown
51 Sb Antimony 121.75 2-8-18-18-5 Unknown Unknown
52 Te Tellurium 127.60 2-8-18-18-6 1782 Franz Muller von Reichenstein
53 I Iodine 126.9045 2-8-18-18-7 1804 Bernard Courtois
54 Xe Xenon 131.29 2-8-18-18-8 1898 Sir William Ramsay
55 Cs Cesium 132.9054 2-8-18-18-8-1 1860 Fustov Kirchoff
56 Ba Barium 137.33 2-8-18-18-8-2 1808 Sir Humphrey Davy
57 La Lanthanum 138.9055 2-8-18-18-9-2 1839 Carl Mosander
58 Ce Cerium 140.12 2-8-18-20-8-2 1803 W. von Hisinger
59 Pr Praseodymium 140.9977 2-8-18-21-8-2 1885 C.F. Aver von Welsbach
60 Nd Neodymium 144.24 2-8-18-22-8-2 1925 C.F. Aver von Welsbach
61 Pm Promethium 145 2-8-18-23-8-2 1945 J.A. Marinsky
62 Sm Samarium 150.36 2-8-18-24-8-2 1879 Paul Emile Lecoq de Boisbaudran
63 Eu Europium 151.96 2-8-18-25-8-2 1901 Eugene Demarcay
64 Gd Gadolinium 157.25 2-8-18-25-9-2 1880 Jean de Marignac
65 Tb Terbium 158.9254 2-8-18-27-8-2 1843 Carl Mosander
66 Dy Dysprosium 162.50 2-8-18-28-8-2 1886 Paul Emile Lecoq de Boisbaudran
67 Ho Holmium 164.9304 2-8-18-29-8-2 1878 J.L. Soret
68 Er Erbium 167.26 2-8-18-30-8-2 1843 Carl Mosander
69 Tm Thulium 168.9342 2-8-18-31-8-2 1879 Per Theodor Cleve
70 Yb Ytterbium 173.04 2-8-18-32-8-2 1878 Jena de Marignac
71 Lu Lutetium 174.967 2-8-18-32-9-2 1907 Georges Urbain
72 Hf Hafnium 178.49 2-8-18-32-10-2 1923 Dirk Coster
73 Ta Tantalum 180.9479 2-8-18-32-11-2 1802 Anders Ekeberg
74 W Tungsten 183.85 2-8-18-32-12-2 1783 Fausto and Juan Jose de Elhuyar
75 Re Rhenium 186.207 2-8-18-32-13-2 1925 Walter Noddack
76 Os Osmium 190.2 2-8-18-32-14-2 1804 Smithson Tenant
77 Ir Iridium 192.2 2-8-18-32-15-2 1804 S. Tenant
78 Pt Platinum 195.08 2-8-18-32-16-2 1735 Julius Scaliger
79 Au Gold 196.9665 2-8-18-32-18-1 3,000 BC Unknown
80 Hg Mercury 200.59 2-8-18-32-18-2 Unknown Unknown
81 Tl Thallium 204.383 2-8-18-32-18-3 1861 Sir William Crookes
82 Pb Lead 207.2 2-8-18-32-18-4 Unknown Unknown
83 Bi Bismuth 208.9804 2-8-18-32-18-5 Unknown Unknown
84 Po Polonium 209 2-8-18-32-18-6 1898 Pierre and Marie Curie
85 At Astatine 210 2-8-18-32-18-7 1940 D.R. Corson
86 Rn Radon 222 2-8-18-32-18-8 1898 Fredrich Ernst Dorn
87 Fr Francium 223 2-8-18-32-18-8-1 1939 Marguerite Derey
88 Ra Radium 226.0254 2-8-18-32-18-8-2 1898 Pierre and Marie Curie
89 Ac Actinium 227.0278 2-8-18-32-18-9-2 1899 Andre Debierne
90 Th Thorium 232.0381 2-8-18-32-18-10-2 1828 Jons Berzelius
91 Pa Protactinium 231.0359 2-8-18-32-20-9-2 1917 Fredrich Soddy
92 U Uranium 238.0289 2-8-18-32-21-9-2 1789 Martin Klaproth
93 Np Neptunium 237.0482 2-8-18-32-22-9-2 1940 E.M. McMillan
94 Pu Plutonium 244 2-8-18-32-24-8-2 1940 G.T. Seaborg
95 Am Americium 243 2-8-18-32-25-8-2 1945 G.T. Seaborg
96 Cm Curium 247 2-8-18-32-25-9-2 1944 G.T. Seaborg
97 Bk Berkelium 247 2-8-18-32-27-8-2 1949 G.T. Seaborg
98 Cf Californium 252 2-8-18-32-28-8-2 1950 G.T. Seaborg
99 Es Einsteinium 254 2-8-18-32-29-8-2 1952 Argonne
100 Fm Fermium 257 2-8-18-32-30-8-2 1953 Argonne
101 Md Mendelevium 258 2-8-18-32-31-8-2 1955 G.T. Seaborg
102 No Nobelium 259 2-8-18-32-32-8-2 1957 Nobel Institute for Physics
103 Lr Lawrencium 260 2-8-18-32-32-9-2 1961 A. Ghiorso
104 Rf Rutherfordium 261 2-8-18-32-32-10-2 1969 A. Ghiorso
105 Ha,Db Hahnium 262 2-8-18-32-32-11-2 1970 A. Ghiorso
106 Sg Seaborgium 263 2-8-18-32-32-12-2 1974 Unconfirmed
107 Ns Neilsborium 262 2-8-18-32-32-13-2 1976 Soviets at Dubna
108 Hs Hassium 265 2-8-18-32-32-14-2 Disputed Unknown
109 Mt Meitnerium 266 2-8-18-32-32-15-2 1982 Heavy Ion Research Lab
110 Uun Ununnilium 269 2-8-18-32-32-17-1 1987 Organessian and al
111 Uuu Unununium 272 2-8-18-32-32-18-1 1994 S. Hofmann
112 Uub Ununbium 277 2-8-18-32-32-18-2 1996 S. Hofmann, V. Ninov, F. P. Hessbuger