NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Potassium (K)

Atomic Number = 19

Atomic Weight = 39.0983

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

K I  Ground State 1s22s22p63s23p64s 2S1/2
       Ionization energy  35009.8140 cm-1 (4.3406633 eV)   Ref. SC85

K II Ground State 1s22s22p63s23p6 1S0
       Ionization energy  255100 cm-1 (31.63 eV)   Ref. K87