NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Actinium (Ac)

Atomic Number = 89

Atomic Weight = (227)

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Ac I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p66d7s2 2D3/2
       Ionization energy  41700 cm-1 (5.17 eV)   Ref. S74

Ac II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s2 1S0
       Ionization energy  94800 cm-1 (11.75 eV)   Ref. MHRS74