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Why is there such a large jump and ionization energy between the second and third ionization energy‘s for magnesium?

User Foosion
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The second ionization energy of Mg is larger than the first because it always takes more energy to remove an electron from a positively charged ion than from a neutral atom. The third ionization energy of magnesium is enormous, however, because the Mg2+ ion has a filled-shell electron configuration.
User Irfan Akram
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