NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Protactinium (Pa)

Atomic Number = 91

Atomic Weight = 231.03588

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Pa I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f26d7s2 4K11/2
       Ionization energy  47500 cm-1 (5.89 eV)   Ref. S74

Pa II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f27s2 3H4