Question
Ionic compounds are formed most easily with
so that it can easily form cation. on the other hand, the electron affinity value of the non-metal atom should be high so that it can easily form anion.
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${{O}_{(g)}}+{{e}^{-}}=O_{(g)}^{-}\Delta {{H}^{o}}=-142\ kJ\,mo{{l}^{-1}}$
$O_{(g)}^{-}+{{e}^{-}}=O_{(g)}^{2-}\Delta {{H}^{o}}=844\ kJ\,mo{{l}^{-1}}$