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
39K 38.963707 93.2581% 3/2 +0.39146 40K 39.963999 0.012% 4 -1.298 41K 40.961825 6.7302% 3/2 +0.21487
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