Isotope Mass Abundance Spin Mag Moment
165Ho 164.93032 100% 7/2
Ho I Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f116s2 4I°15/2 Ionization energy 48567 cm-1 (6.0215 eV) Ref. WSPC78 Ho II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f11(4I°15/2)6s (15/2,1/2)°8 Ionization energy 95200 cm-1 (11.80 eV) Ref. MZH78