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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 ^(-) to O_((g)) ^(-) , Delta H =-141 kJ mol ^(-1),`
`O _(g) ^(-) e ^(-) to O _((g)) ^(2-) , Delta H = + 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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