NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Niobium (Nb)

Atomic Number = 41

Atomic Weight = 92.90638

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
93Nb 92.906377 100% 9/2 +6.1705
Nb I  Ground State 1s22s22p63s23p63d104s24p64d45s  6D1/2
      Ionization energy  54513.8 cm-1 (6.75885 eV)   Ref. RMBH87
Nb II Ground State 1s22s22p63s23p63d104s24p64d4  5D0
      Ionization energy  113000 cm-1 (14.0 eV)   Ref. M52