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NIST Atomic Spectra Database
Ionization Energies Data

Cr (all spectra)
24 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, January 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 
24  Chromium  Cr  [Ar]3d54s   7S3    6.76651                  0.00004    L7185,L2832 
24  Chromium  V  [Ar]3d5   6S5/2    16.486305                 0.000015   L18847 
24  Chromium  Ti  [Ar]3d4   5D0    30.959                    0.025      L7185,L17500 
24  Chromium  Sc  [Ar]3d3   4F3/2    [49.16]                    0.05       L7185,L5498 
24  Chromium  Ca  [Ar]3d2   3F2    [69.46]                    0.04       L1933,L7185 
24  Chromium  K  [Ar]3d   2D3/2    90.6349                   0.0007     L7185,L2229 
24  Chromium  Ar  [Ne]3s23p6   1S0    [160.29]                    0.06       L11770 
24  Chromium  Cl  [Ne]3s23p5   2P°3/2    [184.76]                    0.15       L11770 
24  Chromium  S  [Ne]3s23p4   3P2    [209.5]                     0.3        L11770 
24  Chromium  P  [Ne]3s23p3   4S°3/2    [244.5]                     0.5        L11770 
24  Chromium  Si  [Ne]3s23p2   3P0    [270.8]                     0.5        L7185 
24  Chromium  Al  [Ne]3s23p   2P°1/2    [296.7]                     0.6        L11770 
24  Chromium  Mg  [Ne]3s2   1S0    [354.7]                     0.3        L11770 
24  Chromium  Na  [Ne]3s   2S1/2    [384.163]                   0.006      L11770 
24  Chromium  Ne  1s22s22p6   1S0    [1 011.6]                     0.5        L11770 
24  Chromium  F  1s22s22p5   2P°3/2    [1 097.2]                     1.4        L11770 
24  Chromium  O  1s22s22p4   3P2    [1 188.0]                     2.1        L11770c98 
24  Chromium  N  1s22s22p3   4S°3/2    [1 294.8]                     1.6        L11770 
24  Chromium  C  1s22s22p2   3P0    [1 394.5]                     0.7        L11770 
24  Chromium  B  1s22s22p   2P°1/2    [1 495.1]                     0.7        L11770 
24  Chromium  Be  1s22s2   1S0    [1 634.1]                     0.5        L11770 
24  Chromium  Li  1s22s   2S1/2    (1 721.183)                   0.007      L16264c99 
24  Chromium  He  1s2   1S0    (7 481.8624)                  0.0012     L21139 
24  Chromium  H  1s   2S1/2    (7 894.80289)                 0.00019    L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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