NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Tantalum (Ta)

Atomic Number = 73

Atomic Weight = 180.9479

Reference E95

Isotope    Mass        Abundance Spin Mag Moment
180Ta 179.947462 0.012% 9 181Ta 220.011368 99.998% 7/2 +2.370
Ta I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d36s2  4F3/2
      Ionization energy  60891.4 cm-1 (7.54957 eV)   Ref. SKJ94
Ta II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d36s  5F1