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
227Ac 227.027750 Trace 3/2 -1.1 228Ac 228.031015 Trace 3
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