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Knowing the electron gain enthalpy value...

Knowing the electron gain enthalpy values for `O rarr O^-` and `O rarr O^2-` as `-141` and `702 ~kJ ~mol^-1` respectively, how can you account for the formation of a large number of oxides having `O^ 2-` species and not `O^-`

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Electron gain enthalpy vatues for .0 rarr O^-. and .O rarr O^2- 45-141. and .702 ~kJ ~mol^-1. respectively, .a. large number of oxides having .O^2-. species are formed instead of .O. - because if we take into,account lattice energy factor in the formation of .O^ s. . compound in "which large amount of energy in the form of lattice ènergy is released overall enthalpy is nègative.
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