Isotope Mass Abundance Spin Mag Moment
197Au 196.966543 100% 3/2 +0.1457
Au I Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s 2S1/2 Ionization energy 74408.88 cm-1 (9.22553 eV) Ref. BG78 Au II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d10 1S0 Ionization energy 162950 cm-1 (20.20 eV) Ref. RW97