NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Sodium (Na)

Atomic Number = 11

Atomic Weight = 22.989768

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
23Na 22.989767 100% 3/2 2.21752
Na I  Ground State 1s22s22p63s  2S1/2
      Ionization energy  41449.451 cm-1 (5.139076 eV)   Ref. BBLB98
Na II Ground State 1s22s22p6  1S0
      Ionization energy  381390.2 cm-1 (47.2864 eV)   Ref. MZ81