Chemical Elements

Periodic Number Symbol Name Avg. Mass Stable Known Isotopes Most Abundant Isotope
1 H Hydrogen 1.00794 yes 6 1H
2 He Helium 4.002602 yes 8 4He
3 Li Lithium 6.941 yes 9 7Li
4 Be Beryllium 9.012182 yes 10 9Be
5 B Boron 10.811 yes 13 11B
6 C Carbon 12.0107 yes 15 12C
7 N Nitrogen 14.0067 yes 15 14N
8 O Oxygen 15.9994 yes 15 16O
9 F Fluorine 18.9984032 yes 16 19F
10 Ne Neon 20.1797 yes 17 20Ne
11 Na Sodium 22.98977 yes 18 23Na
12 Mg Magnesium 24.305 yes 18 24Mg
13 Al Aluminium 26.981538 yes 19 27Al
14 Si Silicon 28.0855 yes 21 28Si
15 P Phosphorus 30.973761 yes 23 31P
16 S Sulfur 32.065 yes 24 32S
17 Cl Chlorine 35.453 yes 24 35Cl
18 Ar Argon 39.948 yes 24 40Ar
19 K Potassium 39.0983 yes 24 39K
20 Ca Calcium 40.078 yes 24 40Ca
21 Sc Scandium 44.95591 yes 24 45Sc
22 Ti Titanium 47.867 yes 24 48Ti
23 V Vanadium 50.9415 yes 24 51V
24 Cr Chromium 51.9961 yes 24 52Cr
25 Mn Manganese 54.938049 yes 24 55Mn
26 Fe Iron 55.845 yes 25 56Fe
27 Co Cobalt 58.9332 yes 25 59Co
28 Ni Nickel 58.6934 yes 29 58Ni
29 Cu Copper 63.546 yes 29 63Cu
30 Zn Zinc 58.6934 yes 29 64Zn
31 Ga Gallium 69.7236 yes 29 69Ga
32 Ge Germanium 72.64 yes 29 74Ge
33 As Arsenic 74.9216 yes 30 75As
34 Se Selenium 78.96 yes 28 80Se
35 Br Bromine 79.904 yes 28 79Br
36 Kr Krypton 83.798 yes 29 84Kr
37 Rb Rubidium 85.4678 yes 32 85Rb
38 Sr Strontium 87.62 yes 32 86Sr
39 Y Yttrium 88.90585 yes 30 89Y
40 Zr Zirconium 91.224 yes 30 90Zr
41 Nb Niobium 92.90638 yes 30 93Nb
42 Mo Molybdenum 95.94 yes 31 98Mo
43 Tc Technetium 98.0 no 31 -
44 Ru Ruthenium 101.07 yes 32 102Ru
45 Rh Rhodium 102.9055 yes 33 103Rh
46 Pd Palladium 106.42 yes 33 106Pd
47 Ag Silver 107.8682 yes 34 107Ag
48 Cd Cadmium 112.411 yes 35 114Cd
49 In Indium 114.818 yes 37 115In
50 Sn Tin 118.71 yes 38 120Sn
51 Sb Antimony 121.76 yes 37 121Sb
52 Te Tellurium 127.6 yes 37 130Te
53 I Iodine 126.90447 yes 37 127I
54 Xe Xenon 131.293 yes 38 132Xe
55 Cs Cesium 132.90545 yes 40 133Cs
56 Ba Barium 137.327 yes 40 138Ba
57 La Lathanum 138.9055 yes 39 139La
58 Ce Cerium 140.116 yes 39 140Ce
59 Pr Praseodymium 140.907648 yes 39 141Pr
60 Nd Neodymium 144.24 yes 36 142Nd
61 Pm Prometium 145.0 no 36 -
62 Sm Samarium 150.36 yes 36 152Sm
63 Eu Europium 151.964 yes 36 153Eu
64 Gd Gadolinium 157.25 yes 34 158Gd
65 Tb Terbium 158.92534 yes 34 159Tb
66 Dy Dysprosium 162.5 yes 34 164Dy
67 Ho Holmium 164.93032 yes 34 165Ho
68 Er Erbium 167.259 yes 34 166Er
69 Tm Thulium 168.93421 yes 34 169Tm
70 Yb Ytterbium 173.04 yes 34 174Yb
71 Lu Lutetium 174.967 yes 35 175Lu
72 Hf Hafnium 178.49 yes 33 180Hf
73 Ta Tantalum 180.9479 yes 33 181Ta
74 W Tungsten 178.49 yes 33 184W
75 Re Rhenium 186.207 yes 33 187Re
76 Os Osmium 190.23 yes 35 192Os
77 Ir Iridium 192.217 yes 35 193Ir
78 Pt Platinum 195.078 yes 35 195Pt
79 Au Gold 196.966552 yes 35 197Au
80 Hg Mercury 200.59 yes 34 202Hg
81 Tl Thallium 204.3833 yes 34 205Tl
82 Pb Lead 207.2 yes 34 208Pb
83 Bi Bismuth 208.98038 yes 32 209Bi
84 Po Polonium 209.0 no 29 -
85 At Astatine 210.0 no 31 -
86 Rn Radon 222.0 no 33 -
87 Fr Francium 223.0 no 33 -
88 Ra Radium 226.0 no 32 -
89 Ac Actinium 227.0 no 30 227Ac
90 Th Thorium 232.0381 no 29 227Th
91 Pa Protactinium 231.03588 no 28 -
92 U Uranium 238.02891 no 25 238U
93 Np Neptunium 237.0 no 20 -
94 Pu Plutonium 237.0 no 20 -
95 Am Americium 243.0 no 19 -
96 Cm Curium 247.0 no 20 -
97 Bk Berkelium 247.0 no 20 -
98 Cf Californium 251.0 no 20 -
99 Es Einsteinium 252.0 no 18 -
100 Fm Fermium 257.0 no 18 -
101 Md Mendelevium 258.0 no 16 -
102 No Nobelium 259.0 no 14 -
103 Lr Lawrencium 262.0 no 13 -
104 Rf Rutherfordium 261.0 no 12 -
105 Db Dubnium 262.0 no 11 -
106 Sg Seaborgium 266.0 no 9 -
107 Bh Bohrium 264.0 no 8 -
108 Hs Hassium 277.0 no 8 -
109 Mt Meitnerium 268.0 no 7 -
110 Ds Darmstadtium 281.0 no 8 -