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ATOMIC | ATOMIC ATOMIC | ATOMIC ATOMIC | ATOMIC NUMBER] WEIGHT | ELEMENT NUMBER] WEIGHT | ELEMENT NUMBER | WEIGHT | ELEMENT 1.00794 Hydrogen 85.4678 Rubidium 180.9479 Tantalum 4.0026 Helium 87.62 Strontium 183.85 Wolfram 6.9410 Lithium 88.9059 Yttrium 186.207 Rhenium 9.0122 Beryllium 91.22 Zirconium 190.20 Osmium 10.81 Boron 92.9064 Niobium 192.22 Indium 12.011 Carbon 95.94 Molybdenum 195.08 Platinum 14.0067 Nitrogen 4.0067 Technetium 196.9665 Gold 15.9994 Oxygen 101.07 Ruthenium 200.59 Mercury 18.9984 Fluorine 02.9255 Rhodium 204.383 Thallium 20.179 Neon 06.42 Palladium 207.2 Lead 22.98977 Sodium 107.8682 Silver 208.9804 Bismuth 24.305 Magnesium 112.41 Cadmium (209) Polonium 26.98 154 Aluminium 14.82 (210) Astatine 28.0855 Silicon 18.69 i (222) Radon 30.97376 Phosphorus 121.75 (223) Francium 32.06 Sulfur 127.68 Tellurium 226.0254 Radium 35.453 Chlorine 26.9045 Iodine 227.0278 Actinium 39.948 Argon 31.29 Xenon 232.0381 Thorium 39.0983 Potassium 132.9054 Caesium 231.0359 Protectinium 40.08 Calcium 137.33 Barium 238.0289 Uranium 44.9559 Scandium 39.9055 Lanthanum 237.0482 Neptunium 47.88 Titanium 40.12 Cerium (244) Plutonium 50.9415 Vanadium 140.9077 Praseodymium (243) Americium 51.996 Chromium 144.24 Neodymium (247) Curium 54.9380 Manganese (145) Promethium (247) Berkelium 55.847 Tron 150.36 Samarium (251) Californium 58.9332 Cobalt 151.96 Europium (252) Einsteinium 58.69 Nickel 157.25 Gadolinium (257) Fermium 63.546 Copper 158.9254 Terbium (258) Mendelevium 65.38 Zinc 162.50 Dysprosium (259) Nobelium 69.72 Gallium 164.9304 Holmium (260) Lawrencium 72.59 Germanium 167.26 Erbium (261) (Unnilquadium) 74.9216 Arsenic 168.9342 Thulium (262) (Unnilpentium) 78.96 Selenium 173.04 Ytterbium (263) (Unnilhexium) 79.904 Bromine 174.967 Lutetium 83.80 Krypton 178.49 Hafnium Table 1. The table of Standard Atomic Weights. The Atomic weight of an element is a product of the base mass of all matter (which is constant) and the particle spin velocity. It is therefore variable as it depends entirely upon the particle spin environment in which it is measured.