Periodic Table with Atomic Mass at Chemical Elements.com

Parentheses Indicate Mass of Most Stable Isotope



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  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 H He
1.00794 4.002602
2 Li Be B C N O F Ne
6.941 9.012182 10.811 12.0107 14.00674 15.9994 18.9984032 20.1797
3 Na Mg Al Si P S Cl Ar
22.989770 24.3050 26.981538 28.0855 30.973761 32.066 35.4527 39.948
4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
39.0983 40.078 44.955910 47.867 50.9415 51.9961 54.938049 55.845 58.933200 58.6934 63.546 65.39 69.723 72.61 74.92160 78.96 79.904 83.80
5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
85.4678 87.62 88.90585 91.224 92.90638 95.94 (98) 101.07 102.90550 106.42 107.8682 112.411 114.818 118.710 121.760 127.60 126.90447 131.29
6 Cs Ba * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
132.90545 137.327 178.49 180.9479 183.84 186.207 190.23 192.217 195.078 196.96655 200.59 204.3833 207.2 208.98038 (209) (210) (222)
7 Fr Ra ** Rf Db Sg Bh Hs Mt Uun Uuu Uub
(223) (226) (261) (262) (263) (262) (265) (266) (269) (272) (277)
* La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
138.9055 140.116 140.90765 144.24 (145) 150.36 151.964 157.25 158.92534 162.50 164.93032 167.26 168.93421 173.04 174.967
** Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
(227) 232.0381 231.03588 238.0289 (237) (244) (243) (247) (247) (251) (252) (257) (258) (259) (262)
Element Groups (Families)
Alkali Earth Alkaline Earth Transition Metals
Rare Earth Other Metals Metalloids
Non-Metals Halogens Noble Gases