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NIST Atomic Spectra Database
Ionization Energies Data

Mg (all spectra)
12 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 
12  Magnesium  Mg  [Ne]3s2   1S0    7.646236                 0.000004   L10635,L6969 
12  Magnesium  Na  [Ne]3s   2S1/2    15.035271                 0.000006   L10635 
12  Magnesium  Ne  1s22s22p6   1S0    80.1436                   0.0006     L4995,L1434 
12  Magnesium  F  1s22s22p5   2P°3/2    [109.2654]                  0.0012     L4995,L2720 
12  Magnesium  O  1s22s22p4   3P2    [141.33]                    0.03       L11770 
12  Magnesium  N  1s22s22p3   4S°3/2    [186.76]                    0.06       L10635 
12  Magnesium  C  1s22s22p2   3P0    [225.02]                    0.06       L11770 
12  Magnesium  B  1s22s22p   2P°1/2    [265.924]                   0.019      L11770 
12  Magnesium  Be  1s22s2   1S0    [327.99]                    0.04       L11770 
12  Magnesium  Li  1s22s   2S1/2    (367.489)                   0.007      L16264c99 
12  Magnesium  He  1s2   1S0    (1 761.8049)                  0.0010     L21139 
12  Magnesium  H  1s   2S1/2    (1 962.663889)                0.000007   L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6

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