Chemistry · Periodic Properties

The electron gain enthalpy (electron affinity) is positive (endothermic) in which of the following transformations?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1O(g) → O2+(g) + 2e-
2O(g) → O+(g) + e-
3O-(g) + e- → O2-(g)✓
4O(g) + e- → O-(g)

Correct answer

O-(g) + e- → O2-(g)

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