### 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