The first ionization enthalpy of O is less th | vedclass

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(B) The electronic configuration of $N$ $(Z=7)$ is $1s^2 2s^2 2p^3$. It has a stable half-filled $p$-orbital configuration. The electronic configurati

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The former has partially filled orbitals,while the latter has half-filled orbitals.

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(B) The electronic configuration of $N$ $(Z=7)$ is $1s^2 2s^2 2p^3$. It has a stable half-filled $p$-orbital configuration. The electronic configuration of $O$ $(Z=8)$ is $1s^2 2s^2 2p^4$. Removing an electron from the stable half-filled $2p^3$ orbital of $N$ requires more energy than removing an electron from the $2p^4$ orbital of $O$. Therefore,the first ionization enthalpy of $O$ is less than that of $N$.

The first ionization enthalpy of $O$ is less than that of $N$,because .........

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