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First and second electron gain enthalpie...

First and second electron gain enthalpies of oxygen are `-141 and + 702 kJ mol^(-1)` How is large number of oxides accounted for ? 

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`O_((g))+e^(-)rarrO_((g))^(-),DeltaH=-141 kJ mol^(-1),`
`O_((g))^(-)+e^(-)rarrO_((g))^(2-),DeltaH=+702 kJ mol^(-1)`
Formation of `O^(-)` is exothermic and `O^(2-)` is endothermic. However, oxygen is divalent and forms oxide with stable `ns^(2)np^(6)` configuration. Further, the lattice energies of oxides are very high on account of greater electrostatic forces of attraction.
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