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8.
The formation of the oxide ion O2- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below,
Thus, the process of formation of O2- in the gas phase is unfavourable even though O2- is isoelectronic with neon. It is due to the fact that
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electron repulsion outweighs the stability gained by achieving a noble gas configuration
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O- ion has comparatively smaller size that oxygen atom
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oxygen is more electronegative
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oxygen is more electronegative
A.
electron repulsion outweighs the stability gained by achieving a noble gas configuration
Electron repulsion predominates over the stability gained by achieving noble gas configuration. Hence, the formation of O2- in the gas phase is unfavourable.
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