The first ionisation enthalpy of magnesium is higher than that of sodium. On the other hand, the second ionisation enthalpy of sodium is very much higher than that of magnesium. Explain.

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Magnesium has one more proton in its nucleus to hold on to the electrons in the 3s orbital. ... The third ionization energy of magnesium is enormous, however, because the Mg2+ ion has a filled-shell electron configuration.
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