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Appendix C • Periodic Table of the Elements *Lanthanide series **Actinide series Atomic number Symbol Electron configuration 20 Ca Atomic mass † 58 90 57 89 3 11 19 37 55 87 20 38 56 88 21 39 57-71* 89-103** 22 40 72 104 23 41 73 105 24 42 74 106 25 43 75 107 26 44 76 108 27 45 77 109 4 12 59 60 61 62 94 93 92 91 1 Li Na K Rb Cs Fr Ca Sr Ba Ra Sc Y Ti Zr Hf Rf V Nb Ta Db Cr Mo W Sg Mn Tc Re Bh Fe Ru Os Hs Co Rh Ir Mt Be Mg Ce Pr Nd Pm Sm Pu Np U Pa Th H La Ac 4 s 2 5 f 6 6 d 0 7 s 2 5 f 4 6 d 1 7 s 2 5 f 3 6 d 1 7 s 2 5 f 2 6 d 1 7 s 2 6 d 2 7 s 2 6 d 1 7 s 2 4 f 6 6 s 2 4 f 5 6 s 2 4 f 4 6 s 2 4 f 3 6 s 2 5 d 1 4 f 1 6 s 2 5 d 1 6 s 2 6 d 3 7 s 2 6 d 2 7 s 2 7 s 2 7 s 1 5 d 7 6 s 2 5 d 6 6 s 2 5 d 5 6 s 2 5 d 4 6 s 2 5 d 3 6 s 2 5 d 2 6 s 2 6 s 2 6 s 1 4 d 8 5 s 1 4 d 7 5 s 1 4 d 5 5 s 2 4 d 5 5 s 1 4 d 4 5 s 1 4 d 2 5 s 2 4 d 1 5 s 2 5 s 2 5 s 1 3 d 7 4 s 2 3 d 6 4 s 2 3 d 5 4 s 2 3 d 5 4 s 1 3 d 3 4 s 2 3 d 2 4 s 2 3 d 1 4 s 2 4 s 2 4 s 1 3 s 2 3 s 1 2 s 2 2 s 1 1 s (261) (262) (266) (264) (269) (268) 6.941 9.0122 1.007 9 22.990 39.098 85.468 132.91 (223) 40.078 87.62 137.33 (226) 44.956 88.906 47.867 91.224 178.49 50.942 92.906 180.95 51.996 95.94 183.84 54.938 (98) 186.21 55.845 101.07 190.23 58.933 102.91 192.2 24.305 140.12 140.91 144.24 (145) 150.36 (244) (237) 238.03 231.04 232.04 40.078 138.91 (227) Group I Group II Transition elements physics.nist.gov/atomic A.30 |