INTERNATIONAL ATOMIC WEIGHTS 1969

The atomic weights are based on the 1969 international agreed values of the International Union of Pure and Applied Chemistry, the basis being the carbon 12 isotope. Value in brackets indicate the mass numbers of the most stable isotopes.
Element Symbol Atomic no.  Atomic weight Actinium Ac 89 227 Aluminium Al 13 26.98 American Am 95 243 Antimony Sb 51 121.75 Argon A 18 39.948 Arsenic As 33 74.922 Astatine At 85 210 Barium Ba 56 137.34 Berkelium Bk 97 249 Beryllium Be 4 9.0122 Bismuth Bi 83 208.98 Boron B 5 10.81 Bromine Br 35 79.904 Cadmium Cd 48 112.4 Caesium Cs 55 132.91 Calcium Ca 20 40.08 Californium Cf 98 251 Carbon C 6 12.011 Cerium Ce 58 140.12 Chlorine Cl 17 35.453 Chromium Cr 24 51.996 Cobalt Co 27 58.933 Copper Cu 29 63.55 Curium Cm 96 247 Dysprosium Dy 66 162.5 Einsteinium Es 99 254 Erbium Er 68 167.26 Europium Eu 63 151.96 Fermium Fm 100 253 Fluorine F 9 18.998 Francium Fr 87 223 Gadolinium Gd 64 157.25 Gallium Ga 31 69.72 Germanium Ge 32 72.59 Gold Au 79 196.97 Hafnium Hf 72 178.49 Helium He 2 4.003 Holmium Ho 67 164.93 Hydrogen H 1 1.008 Indium In 49 114.82 Iodine I 53 126.9 Iridium Ir 77 192.22 Iron Fe 26 55.847 Krypton Kr 36 83.8 Lanthanum La 57 138.91 Lead Pb 82 207.21 Lithium Li 3 6.941 Lutetium Lu 71 174.97 Magnesium Mg 12 24.305 Manganese Mn 25 54.938 Mendelevium Md 101 256 Mercury Hg 80 200.59 Molybdenum Mo 42 95.94 Neodymium Nd 60 144.24 Neon Ne 10 20.179 Neptunium Np 93 237 Nickel Ni 28 58.71 Niobium Nb 41 92.91 Nitrogen N 7 14.007 Nobelium No 102 254 Osmium Os 76 190.2 Oxygen O 8 15.999 Palladium Pd 46 106.4 Phosphorus P 15 30.974 Platinum Pt 78 195.09 Plutonium Pu 94 242 Polonium Po 84 210 Poromethium Pm 61 145 Potassium K 19 39.102 Praseodymium Pr 59 140.91 Protactinium Pa 91 234.04 Radium Ra 88 226.03 Radon Rn 86 222 Rhenium Re 75 186.22 Rhodium Rh 45 102.91 Rubidium Rb 37 85.468 Ruthenium Ru 44 101.07 Samarium Sm 62 150.35 Scandium Sc 21 44.956 Selenium Se 34 78.96 Silicon Si 14 28.086 Silver Ag 47 107.87 Sodium Na 11 22.99 Strontium Sr 38 87.62 Sulphur S 16 32.06 Tantalum Ta 73 180.95 Technetium Tc 43 99 Tellurium Te 52 127.6 Terbium Tb 65 158.93 Thallium Tl 81 204.37 Thorium Th 90 232.04 Thulium Tm 69 168.93 Tin Sn 50 118.69 Titanium Ti 22 47.9 Tungsten W 74 183.85 Uranium U 92 238.03 Vanadium V 23 50.94 Xenon Xe 54 131.3 Ytterbium Yb 70 173.04 Yttrium Y 39 88.91 Zinc Zn 30 65.37 Zirconium Zr 40 91.22

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