Question

why first ionization enthalpy of N is more than O​

Answer 1

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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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Answer 2

The ionization enthalpy of nitrogen is more than oxygen because in nitrogen electron is removed from half filled extra stabbled 2P orbital which required more energy then configuration of oxygen in which electron is removed from

${2p}^{3}$

orbital .