NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Chromium (Cr)

Atomic Number = 24

Atomic Weight = 51.9961

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
50Cr 49.946046 4.35% 0 52Cr 51.940509 83.79% 0 53Cr 52.940651 9.50% 3/2 -0.47454 54Cr 53.938882 2.36% 0
Cr I  Ground State 1s22s22p63s23p63d54s  7S3
      Ionization energy  54575.6 cm-1 (6.76651 eV)   Ref. SC85
Cr II Ground State 1s22s22p63s23p63d5  6S5/2
      Ionization energy  132966 cm-1 (16.4857 eV)   Ref. SC85