Atomic PHYSICAL AND CHEMICAL DATA FOR SELECTED ELEMENTS" Crystal structure Atomic mass Density of solid (at 20C) Melting point Atomic number Element Symbol (amu) (Mg/m = g/cm) (at 20C) (C) number 1 Hydrogen H 1.008 -259.34 (T.P.) 1 23456789 21 Helium He 4.003 -271.69 Lithium Li 6.941 0.533 bcc 180.6 Beryllium Boron Be 9.012 1.85 hcp 1,289 Carbon Nitrogen Oxygen Fluorine 10 Neon 11 Sodium Magnesium 13 Aluminum 14 Silicon 15 Phosphorus 16 Sulfur 17 Chlorine 18 29 2222222322588223353 19 Argon Potassium 20 Calcium 21 Scandium Titanium Ti Vanadium 26 27 24 Chromium Manganese Iron Cobalt Fe Nickel Ni 30 31 Copper Zinc Gallium BUZO ZA O > 2 8 8 10.81 2.47 2,092 12.01 2.27 hex. 3,826 (S.P.) 14.01 -210.0042 (T.P.) 234567 16.00 -218.789 (T.P.) 8 19.00 -219.67 (T.P.) 9 20.18 -248.587 (T.P.) 10 22.99 0.966 bcc 97.8 11 Mg 24.31 1.74 hcp 650 12 26.98 2.70 fcc 660.452 13 28.09 2.33 dia. cub. 1,414 14 30.97 1.82 ortho. 44.14 15 (white) (white) 32.06 2.09 ortho. 115.22 16 35.45 -100.97 (T.P.) 39.95 -189.352 (T.P.) 18 39.10 0.862 bcc 63.71 19 40.08 1.53 fcc 842 20 44.96 2.99 fcc 1,541 21 47.90 4.51 hcp 1,670 22 50.94 6.09 bcc 1,910 23 52.00 7.19 bcc 1,863 Mn 54.94 7.47 cubic 1,246 55.85 7.87 bcc 1,538 58.93 8.8 hcp 1,495 58.71 8.91 fcc 1,455 63.55 8.93 fcc 1,084.87 65.38 7.13 hcp 419.58 69.72 5.91 ortho. 29.7741 (T.P.) Germanium Ge 72.59 5.32 dia.cub. 938.3 Arsenic As 74.92 5.78 rhomb. 34 Selenium Se 78.96 4.81 hex. 603 (S.P.) 221 Bromine Br 79.90 -7.25 (T.P.) 36 Krypton Kr 83.80 -157.385 37 Rubidium Rb 85.47 1.53 bcc 39.48 Strontium Sr 87.62 2.58 fcc 769 39 Yttrium Y 88.91 4.48 hcp 1,522 40 Zirconium Zr 91.22 6.51 hcp 1,855 41 Niobium Nb 92.91 8.58 bcc 2,469 42 Molybdenum Mo 95.94 10.22 bcc 2,623 23223385888538979 24 26 30 31 34 36 40 41 42 "For a complete listing, see Appendix 1.