Z sym A Mass(amu) A_most_ab rho (g/cm3) 1 H 1 1.00783 1.008 0.071486 2 He 4 4.00260 4.0026 0.12588 3 Li 7 7.01600 6.941 0.52969 4 Be 9 9.01218 9.0122 1.8024 5 B 11 11.0093 10.811 2.3502 6 C 12 12.0000 12.011 2.2662 7 N 14 14.0031 14.007 0.80963 8 O 16 15.9949 15.999 1.1429 9 F 19 18.9984 18.998 1.1111 10 Ne 20 19.9924 20.183 1.2015 11 Na 23 22.9898 22.989 0.97 12 Mg 24 23.9850 24.312 1.7366 13 Al 27 26.9815 26.981 2.6981 14 Si 28 27.9769 28.086 2.3212 15 P 31 30.9738 30.973 1.8219 16 S 32 31.9721 32.064 2.0686 17 Cl 35 34.9689 35.453 1.8956 18 Ar 40 39.9624 39.948 1.6504 19 K 39 38.9637 39.102 0.86318 20 Ca 40 39.9626 40.08 1.54 21 Sc 45 44.9559 44.956 2.9971 22 Ti 48 47.9479 47.9 4.5189 23 V 51 50.9440 50.942 6.1008 24 Cr 52 51.9405 51.996 7.1917 25 Mn 55 54.9380 54.938 7.4341 26 Fe 56 55.9349 55.847 7.8658 27 Co 59 58.9332 58.933 8.796 28 Ni 58 57.9353 58.71 8.8955 29 Cu 63 62.9296 63.54 8.9493 30 Zn 64 63.9291 65.37 7.1054 31 Ga 69 68.9256 69.72 5.9085 32 Ge 74 73.9212 72.59 5.3375 33 As 75 74.9216 74.922 5.7192 34 Se 80 79.9165 78.96 4.7855 35 Br 79 78.9183 79.909 3.3995 36 Kr 84 83.9115 83.8 2.6021 37 Rb 85 84.9118 85.47 1.529 38 Sr 88 87.9056 87.62 2.6 39 Y 90 89.9072 88.905 4.4902 40 Zr 90 89.9047 91.22 6.4695 41 Nb 93 92.9064 92.906 8.6024 42 Mo 96 95.9047 95.94 10.206 43 Tc 99 98.9063 99. 11.5 44 Ru 102 101.904 101.07 12.177 45 Rh 103 102.906 102.91 12.399 46 Pd 106 105.903 106.4 11.955 47 Ag 107 106.905 107.87 10.473 48 Cd 114 113.903 112.4 8.5802 49 In 115 114.904 114.82 7.3134 50 Sn 120 119.902 118.69 7.2816 51 Sb 121 120.904 121.75 6.6168 52 Te 130 129.906 127.6 6.2244 53 I 127 126.904 126.9 4.9373 54 Xe 130 129.904 131.3 3.0589 55 Cs 134 133.907 132.91 1.8986 56 Ba 138 137.905 137.34 3.5215 57 La 139 138.906 138.91 6.1738 58 Ce 140 139.905 140.12 6.6724 59 Pr 141 140.908 140.91 6.7744 60 Nd 142 141.908 144.24 7.0019 61 Pm 147 146.915 147. 7.22 62 Sm 152 151.920 150.35 7.5553 63 Eu 153 152.921 151.96 5.2581 64 Gd 158 157.924 157.25 7.902 65 Tb 160 159.927 158.92 8.2773 66 Dy 164 163.929 162.5 8.5526 67 Ho 165 164.930 164.93 8.8198 68 Er 166 165.930 167.26 9.0902 69 Tm 169 168.934 168.93 9.3331 70 Yb 174 173.939 173.04 6.9774 71 Lu 175 175.941 174.97 9.8298 72 Hf 180 179.947 178.49 13.124 73 Ta 181 180.948 180.95 16.601 74 W 184 183.951 183.85 19.292 75 Re 187 186.956 186.2 21.04 76 Os 192 191.961 190.2 22.562 77 Ir 193 192.963 192.2 22.506 78 Pt 195 194.965 195.09 21.438 79 Au 197 196.967 196.97 19.311 80 Hg 202 201.971 200.59 13.553 81 Tl 205 204.974 204.37 11.882 82 Pb 208 207.977 207.19 11.322 83 Bi 209 208.980 208.98 9.8113 84 Po 210 209.983 210. 9.2511 85 At 210 209.987 210. 0. 86 Rn 222 222.018 222. 0.00973 87 Fr 223 223.020 223. 0. 88 Ra 226 226.025 226. 5.0222 89 Ac 227 227.028 227. 10.07 90 Th 232 232.038 232. 11.658 91 Pa 231 231.036 231. 15.4 92 U 238 238.051 238.04 19.043 1 H 2 2.01410 1.008 0.071486 1 H 3 3.01605 1.008 0.071486 2 He 3 3.01603 4.0026 0.12588 2 He 6 6.01889 4.0026 0.12588 3 Li 6 6.01512 6.941 0.52969 3 Li 8 8.02249 6.941 0.52969 3 Li 9 9.02679 6.941 0.52969 4 Be 7 7.01693 9.0122 1.8024 4 Be 10 10.0135 9.0122 1.8024 5 B 10 10.0129 10.811 2.3502 5 B 12 12.0144 10.811 2.3502 5 B 13 13.0178 10.811 2.3502 6 C 11 11.0114 12.011 2.2662 6 C 13 13.0034 12.011 2.2662 6 C 14 14.0032 12.011 2.2662 7 N 15 15.0001 14.007 0.80963