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NIST Atomic Spectra Database
Ionization Energies Data

K (all spectra)
19 Data Rows Found 
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2024). NIST Atomic Spectra Database (ver. 5.12), [Online]. Available: https://physics.nist.gov/asd [2025, March 19]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells a   Ground  Level   Ionization  Energy 
 (eV) 		 Uncertainty
 (eV) 		  References 
19  Potassium  K  [Ar]4s   2S1/2    4.34066373                 0.00000009   L5451,L5783,L7185 
19  Potassium  Ar  [Ne]3s23p6   1S0    31.62500                    0.00019      L12188 
19  Potassium  Cl  [Ne]3s23p5   2P°3/2    [45.8031]                    0.0017       L11770 
19  Potassium  S  [Ne]3s23p4   3P2    [60.917]                     0.019        L11770 
19  Potassium  P  [Ne]3s23p3   4S°3/2    [82.66]                      0.16         L241 
19  Potassium  Si  [Ne]3s23p2   3P0    [99.44]                      0.20         L7185 
19  Potassium  Al  [Ne]3s23p   2P°1/2    117.56                       0.11         L7185 
19  Potassium  Mg  [Ne]3s2   1S0    [154.87]                      0.05         L12392 
19  Potassium  Na  [Ne]3s   2S1/2    [175.8174]                    0.0025       L4344 
19  Potassium  Ne  1s22s22p6   1S0    [503.67]                      0.07         L11770 
19  Potassium  F  1s22s22p5   2P°3/2    [565.6]                       0.7          L11770 
19  Potassium  O  1s22s22p4   3P2    [631.1]                       0.9          L11770 
19  Potassium  N  1s22s22p3   4S°3/2    [714.7]                       0.5          L11770 
19  Potassium  C  1s22s22p2   3P0    [786.3]                       0.3          L11770 
19  Potassium  B  1s22s22p   2P°1/2    [860.92]                      0.25         L11770 
19  Potassium  Be  1s22s2   1S0    [967.7]                       0.3          L11770 
19  Potassium  Li  1s22s   2S1/2    (1 034.542)                     0.007        L16264c99 
19  Potassium  He  1s2   1S0    (4 610.80714)                   0.00025      L21139 
19  Potassium  H  1s   2S1/2    (4 934.04979)                   0.00005      L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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