NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Arsenic (As)

Atomic Number = 33

Atomic Weight = 74.9216

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
75As 74.921594 100% 3/2 +1.43947
As I  Ground State 1s22s22p63s23p63d104s24p3  43/2
      Ionization energy  78950 cm-1 (9.7886 eV)   Ref. BJ71
As II Ground State 1s22s22p63s23p63d104s24p2  3P0
      Ionization energy  149932 cm-1 (18.5892 eV)   Ref. LA71