although oxygen has greater effective nuclear charge but nitrogen has higher ionization enthalpy that of the oxygen explain why
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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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The effective nuclear charge of oxygen is higher than that of nitrogen, and the oxygen atom is smaller than the nitrogen atom. Both factors contribute to the first ionization energy of oxygen being higher than the first ionization energy of nitrogen.
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