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Why is oxygen's first ionization enthalpy below nitrogen's?
ASmaller nuclear charge of oxygen
BRemoval of a 2s electron in oxygen
CPairing repulsion in a 2p orbital
DLarger atomic size of oxygen
Answer & Solution
Correct answer: C. Pairing repulsion in a 2p orbital
In oxygen two of the four 2p electrons share one orbital, and their repulsion makes one easier to remove.
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