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
9Be 9.012182 100% 3/2 -1.1776 10Be 10.013534 Trace 0
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