NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Chlorine (Cl)

Atomic Number = 17

Atomic Weight = 35.4527

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
35Cl 34.968852 75.77% 3/2 +0.82187 37Cl 36.965903 24.23% 3/2 +0.68412
Cl I  Ground State 1s22s22p63s23p5  23/2
      Ionization energy  104591.0 cm-1 (12.96763 eV)   Ref. RK69
Cl II Ground State 1s22s22p63s23p4  3P2
      Ionization energy  192070 cm-1 (23.8136 eV)   Ref. RK74