Isotope Mass Abundance Spin Mag Moment
249Cf 249.074844 0 9/2 251Cf 251.079580 0 1/2 252Cf 252.081621 0 0
Cf I Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f107s2 5I8 Ionization energy 50665 cm-1 (6.2817 eV) Ref. KDEE97 Cf II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f107s (8,1/2)17/2 Ionization energy [95000] cm-1 (11.8 eV) Ref. CNWM70