DescriptionIonization energies of atoms - labeled - atomic orbital filling indicated.svg
English: Ionization energy is the minimal energy needed to remove an electron from a neutral atom. The ionization energies grow within a period in the periodic table of elements from alkali metals to noble gases, and reach local maxima as each of the s, p, d and f orbitals fill.
Based on File:Ionization energies.svg by RJHall and Hardwigg. According to them, data for this diagram comes from Martin, W. C.; Wiese, W. L. (1996) Atomic, Molecular, & Optical Physics Handbook, American Institute of Physics ISBN156396242X
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