NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Aluminum (Al)

Atomic Number = 13

Atomic Weight = 26.98154

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
27Al 26.981540 100% 5/2 +3.6415
Al I  Ground State 1s22s22p63s23p  2P1/2
      Ionization energy  48278.48 cm-1 (5.985768 eV)   Ref. KM91b
Al II Ground State 1s22s22p63s2  1S0
      Ionization energy  151862.5 cm-1 (18.82855 eV)   Ref. KM91b