Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has Correct Answer Stable half filled 2p sub level

Nitrogen has a half filled orbital. On the other hand, since Oxygen is already unstable relative to Nitrogen, by losing one electron it attains a stable half filled orbital. So oxygen undergoes ionisation at a relatively lower energy. This is why nitrogen has a higher ionisation energy than oxygen.
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