Isotope Mass Abundance Spin Mag Moment
152Gd 151.919786 0.20% 0 154Gd 153.920861 2.18% 0 155Gd 154.922618 14.80% 3/2 -0.27 156Gd 155.922118 20.47% 0 157Gd 156.923956 15.65% 3/2 -0.36 158Gd 157.924099 24.84% 0 160Gd 159.927049 21.86% 0
Gd I Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f75d6s2 9D°2 Ionization energy 49601.45 cm-1 (6.14980 eV) Ref. MOW98 Gd II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f75d6s 10D°5/2 Ionization energy 97500 cm-1 (12.09 eV) Ref. SR73