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

237Np      237.048167  0         5/2  +3.14

 
Np I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f46d7s2  6L11/2
      Ionization energy  50536 cm-1 (6.2657 eV)   Ref. KDEE97
 
Np II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f46d7s  7L5