Isotope Mass Abundance Spin Mag Moment
247Bk 247.070300 0 3/2 249Bk 249.074980 0 7/2 2.0
Bk I Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f97s2 6H°15/2 Ionization energy 49989 cm-1 (6.1979 eV) Ref. KDEE97 Bk II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f97s (15/2,1/2)°8