NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Neptunium (Np)

Atomic Number = 93

Atomic Weight = 237.0482

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Np I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f46d7s2 6L11/2
       Ionization energy  50536 cm-1 (6.2657 eV)   Ref. KDEE97

Np II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f46d7s 7L5