The formation of the oxide ion, O2−(g) , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:
O(g)+e−⟶O−(g);ΔfH⊖=−141kJmol−1
O−(g)+e−⟶O2−(g);ΔfH⊖=+780kJmol−1
Thus process of formation of O2− in gas phase is unfavourable though O2− is isoelectronic with neon. It is due to the fact that,
Held on 30 Apr 2015 · Verified 9 Jul 2026.
Electron repulsion outweighs the stability gained by achieving noble gas configuration.
O− Ion has comparatively smaller size than oxygen atom.
Oxygen is more electronegative.
Addition of electron in oxygen results in larger size of the ion.
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