NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Beryllium (Be)

Atomic Number = 4

Atomic Weight = 9.01218

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Be I  Ground State 1s22s2 1S0
       Ionization energy  75192.64 cm-1 (9.32270 eV)   Ref. KM97

Be II Ground State 1s22s 2S1/2
       Ionization energy  146882.8 cm-1 (18.21114 eV)   Ref. KM00