Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The formation of the oxide ion, 
from oxygen atom requires first an exothermic and then an endothermic step as shown below: 
Thus, process of formation of 
in gas phase is unfavourable even though 
is isoelectronic with neon. It is due to the fact that,
A
ion has comparatively smaller size than oxygen atom
B
oxygen is more electronegative
C
addition of electron in oxygen results in larger size of the ion
D
electron repulsion outweighs the stability gained by achieving noble gas configuration.
Text Solution
Verified by ExpertsThe correct answer is:
D
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