Actinium Ac 89 227.0277*
Aluminum Al 13 26.981538
Amercium Am 95 243.0614*
Antimony Sb 51 121.760
Argon
Ar 18 39.948
Arsenic
As 33 74.92160
Astatine At 85 209.9871
Barium Ba 56 137.327
Berkelium
Bk 97 247.0703*
Beryllium Be 4 9.012182
Bismuth Bi 83 208.98038
Bohrium Bh 107 264.12*
Boron
B 5 10.811
Bromine
Br 35 79.904
Cadmium Cd 48 112.411
Calcium Ca 20 40.078
Californium Cf 98 251.0796*
Carbon
C 6 12.0107
Cerium Ce 58 140.116
Cesium Cs 55 132.90545
Chlorine
Cl 17 35.453
Chromium Cr 24 51.9961
Cobalt
Co 27 58.933200
Copper
Cu 29 63.546
Curium Cm 96 247.0704*
Dubnium Db 105 262.1141*
Dysprosium Dy 66 162.50
Einsteinium Es 99 252.0803*
Erbium Er 68 167.259
Europium Eu 63 151.964
Fermium Fm 100 257.0951*
Fluorine
F 9 18.9984032
Francium Fr 87 223.0197*
Gadolinium Gd 64 157.25
Gallium Ga 31 69.723
Germanium Ge 32 72.64
Gold
Au 79 196.96655
Hafnium Hf 72 178.49
Helium He 2 4.002602
Holmium Ho 67 164.93032
Hydrogen H 1 1.00794
Indium In 49 114.818
Iodine
I
53 126.90447
Iridium Ir 77 192.217
Iron
Fe 26 55.845
Krypton
Kr 36 83.80
Lanthanum La 57 138.9055
Lawrencium Lr 103 262.1097*
Lead
Pb 82 207.2
Lithium Liber 3 6.941
Lutetium Lu 71 174.967
Magnesium Mg 12 24.3050
Manganese Mn 25 54.938049
Meitnerium Mt 109 268.1388*
Mendelevium Md 101 258.0984*
Element
Symbol
Atomic
number
Atomic
weight
Mercury
Hg 80 200.59
Molybdenum Mo 42 95.94
Neodymium Nd 60 144.24
Neon
Ne 10 20.1797
Neptunium Np 93 237.0482*
Nickel
Ni 28 58.6934
Niobium Nb 41 92.90638
Nitrogen N 7 14.0067
Nobelium No 102 259.1010*
Osmium Os 76 190.23
Oxygen
O 8 15.9994
Palladium Pd 46 106.42
Phosphorus P 15 30.973761
Platinum Pt 78 195.078
Plutonium Pu 94 244.0642*
Polonium Po 84 208.9824*
Potassium K 19 39.0983
Praseodymium Pr 59 140.90765
Promrthium Pm 61 144.9127*
Protactinium Pa 91 231.03588*
Radium Ra 88 226.0254*
Radon
Rn 86 222.0176*
Rhenium Re 75 186.207
Rhodium Rh 45 102.90550
Rubidium Rb 37 85.4678
Ruthenium Ru 44 101.07
Rutherfordium Rf 104 261.1088*
Samarium Sm 62 150.36
Scandium Sc 21 44.955910
Seaborgium Sg 106 266.1219*
Selenium Se 34 78.96
Silicon
Si 14 28.0855
Silver
Ag 47 107.8682
Sodium Na 11 22.989770
Strontium Sr 38 87.62
Sulfur
S 16 32.065
Tantalum Ta 73 180.9479
Technetium Tc 43 97.9072*
Tellurium Te 52 127.60
Terbium Tb 65 158.92534
Thallium Tl 81 204.3833
Thorium Th 90 232.0381*
Thulium Tm 69 168.93421
Tin
Sn 50 118.710
Titanium Ti 22 47.867
Tungsten W 74 183.84
Unununium Uuu 111 272.1535*
Uranium U 92 238.0291
Vanadium V 23 50.9415
Xenon
Xe 54 131.293
Ytterbium Yb 70 173.04
Yttrium Y 39 88.90585
Zinc
Zn 30 65.39
Zirconium Zr 40 91.224
Element
Symbol
Atomic
number
Atomic
weight
*Relative atomic mass of the isotope of that element of longest known half-life.
