Zn I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4s 2 1 S 0 Ionization energy 75769.33 cm-1 (9.394199 eV) Ref. SM95 Zn II Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4s 2 S 1 / 2 Ionization energy 144892.6 cm-1 (17.96439 eV) Ref. SM95 read more