1 Hydrogen H 0 1.0 grams 313.6 kcal/mole 2 Helium He 2 4.00 grams 567 kcal/mole 3 Lithium Li 4 6.94 grams 124 kcal/mole 4 Beryllium Be 5 9.01 grams 215 kcal/mole 5 Boron B 6 10.8 grams 191 kcal/mole 6 Carbon C 6 12.0 grams 260 kcal/mole 7 Nitrogen N 7 14.0 grams 335 kcal/mole 8 Oxygen O 8 16.0 grams 314 kcal/mole 9 Fluorine F 10 19.0 grams 402 kcal/mole 10 Neon Ne 10 20.2 grams 497 kcal/mole 11 Sodium Na 12 23.0 grams 119 kcal/mole 12 Magnesium Mg 12 24.3 grams 176 kcal/mole 13 Aluminum Al 14 27.0 grams 138 kcal/mole 14 Silicon Si 14 28.1 grams 188 kcal/mole 15 Phosphorus P 16 31.0 grams 254 kcal/mole 16 Sulfur S 16 32.1 grams 239 kcal/mole 17 Clorine Cl 18 35.5 grams 300 kcal/mole 18 Argon Ar 22 39.9 grams 363 kcal/mole 19 Potassium K 12 23.0 grams 100 kcal/mole 20 Calcium Ca 20 40.1 grams 141 kcal/mole 21 Scandium Sc 24 45.0 grams 151 kcal/mole 22 Titanium Ti 26 47.9 grams 158 kcal/mole 23 Vanadium V 28 50.9 grams 155 kcal/mole 24 Chromium Cr 28 52.0 grams 156 kcal/mole 25 Manganese Mn 30 54.9 grams 171.4 kcal/mole 26 Iron Fe 30 55.8 grams 182 kcal/mole 27 Cobalt Co 32 58.9 grams 181 kcal/mole 28 Nickel Ni 31 58.7 grams 176 kcal/mole 29 Copper Cu 35 63.5 grams 178.1 kcal/mole 30 Zinc Zn 35 65.4 grams 216.6 kcal/mole 31 Gallium Ga 39 69.7 grams 138 kcal/mole 32 Germanium Ge 41 72.6 grams 182 kcal/mole 33 Arsenic As 42 74.9 grams 226 kcal/mole 34 Selenium Se 45 79.0 grams 225 kcal/mole 35 Bromine Br 45 79.9 grams 273 kcal/mole 36 Krypton Kr 48 83.8 grams 322.8 kcal/mole 37 Rubidium Rb 49 85.5 grams 96.3 kcal/mole 38 Strontium Sr 50 87.6 grams 131.3 kcal/mole 39 Yttrium Y 50 88.9 grams 147 kcal/mole 40 Zirconium Zr 51 91.2 grams 158 kcal/mole 41 Niobium Nb 52 92.9 grams 158.7 kcal/mole 42 Molybdenum Mo 54 95.9 grams 164 kcal/mole 43 Technetium Tc 56 99.0 grams 168 kcal/mole 44 Ruthenium Ru 57 101.1 grams 169.8 kcal/mole 45 Rhodium Rh 58 102.9 grams 172 kcal/mole 46 Palladium Pd 60 106.4 grams 192 kcal/mole 47 Silver Ag 61 107.9 grams 174.7 kcal/mole 48 Cadmium Cd 64 112.4 grams 207.4 kcal/mole 49 Indium In 66 114.8 grams 133.4 kcal/mole 50 Tin Sn 69 118.7 grams 169.3 kcal/mole 51 Antimony Sb 71 121.8 grams 199.2 kcal/mole 52 Tellurium Te 75 127.6 grams 208 kcal/mole 53 Iodine I 74 126.9 grams 241 kcal/mole 54 Xenon Xe 77 131.3 grams 279.7 kcal/mole 55 Cesium Cs 78 132.9 grams 89.9 kcal/mole 56 Barium Ba 81 137.3 grams 120.2 kcal/mole 57 Lanthanum La 82 138.9 grams 129 kcal/mole 58 Cerium Ce 82 140.1 grams 149.9 kcal/mole 59 Praseodymium Pr 82 140.9 grams 131 kcal/mole 60 Neodymium Nd 84 144.2 grams 131 kcal/mole 61 Promethium Pm 84 145 grams kcal/mole 62 Samarium Sm 88 150.4 grams 130 kcal/mole 63 Europium Eu 89 152 grams 131 kcal/mole 64 Gadolinium Gd 93 157.2 grams 142 kcal/mole 65 Terbium Tb 94 158.9 grams 155 kcal/mole 66 Dysprosium Dy 96 162.5 grams 157 kcal/mole 67 Holmium Ho 98 164.9 grams kcal/mole 68 Erbium Er 99 167.3 grams kcal/mole 69 Thulium Tm 100 168.9 grams kcal/mole 70 Ytterbium Yb 103 173 grams 144kcal/mole 71 Lutetium Lu 104 175 grams 141 kcal/mole 72 Hafnium Hf 106 178.5 grams 161 kcal/mole 73 Tantalum Ta 108 180.9 grams 182 kcal/mole 74 Tungsten W 110 183.9 grams 184 kcal/mole 75 Rhenium Re 111 186.2 grams 181 kcal/mole 76 Osmium Os 114 190.2 grams 201 kcal/mole 77 Iridium Ir 115 192.2 grams 207 kcal/mole 78 Platinum Pt 117 195.1 grams 207 kcal/mole 79 Gold Au 118 197 grams 213 kcal/mole 80 Mercury Hg 120 200.6 grams 240.5 kcal/mole 81 Tallium Tl 123 204.4 grams 140.8 kcal/mole 82 Lead Pb 125 207.2 grams 170.9 kcal/mole 83 Bismuth Bi 126 209 grams 168 kcal/mole 84 Polonium Po 126 210 grams 194 kcal/mole 85 Astatine At 125 210 grams 219 kcal/mole 86 Radon Rn 136 222 grams 247.8 kcal/mole 87 Francium Fr 136 223 grams 88.3 kcal/mole 88 Radium Ra 138 226 grams 121.7 kcal/mole 89 Actinium Ac 138 227 grams 159 kcal/mole 90 Thorium Th 142 232 grams kcal/mole 91 Protactinium Pa 140 231 grams kcal/mole 92 Uranium U 146 238 grams 92 kcal/mole 93 Neptunium Np 144 237 grams kcal/mole 94 Plutonium Pu 148 242 grams 118 kcal/mole 95 Americium Am 148 243 grams 138 kcal/mole 96 Curium Cm 152 248 grams kcal/mole 97 Berkelium Bk 150 247 grams kcal/mole 98 Californium Cf 153 251 grams kcal/mole 99 Einsteinium Es 155 254 grams kcal/mole 100 Fermium Fm 157 257 grams kcal/mole 101 Mendelevium Md 157 258 grams kcal/mole 102 Nobelium No 157 259 grams kcal/mole 103 Lawrencium Lr 157 260 grams kcal/mole 104 Rutherfordium Rf 157 261 grams kcal/mole 105 Dubnium Db 157 262 grams kcal/mole 106 Seaborgium Sg 157 263 grams kcal/mole 107 Bohrium Bh 155 262 grams kcal/mole 108 Hassium Hs 157 265 grams kcal/mole 109 Meitnerium Mt 157 266 grams kcal/mole 110 Ununnilium Uun 159 269 grams kcal/mole 111 Unununium Uuu 161 272 grams kcal/mole 112 Ununbium Uub 165 277 grams kcal/mole 113 Ununtrium Uut 169 282 grams kcal/mole 114 Ununquadium Uuq 171 285 grams kcal/mole 115 grams kcal/mole 116 Ununhexium Uuh 173 289 grams kcal/mole 117 grams kcal/mole 118 Ununoctium Uuo 175 293 grams kcal/mole