NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Boron (B)

Atomic Number = 5

Atomic Weight = 10.81

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
10B 10.012937 19.9% 3 +1.8007 11B 11.009305 80.1% 3/2 +2.6886
B I  Ground State 1s22s22p  21/2
     Ionization energy  66928.04 cm-1 (8.29802 eV)   Ref. R02
B II Ground State 1s22s2  1S0
     Ionization energy  202887.0 cm-1 (25.1548 eV)   Ref. R98