Which has maximum first ionization potential?

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Question

(B) The electronic configurations of the elements in their valence shells are: $B: 2s^2 2p^1$ $C: 2s^2 2p^2$ $N: 2s^2 2p^3$ $O: 2s^2 2p^4$ Ionization

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$N$

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(B) The electronic configurations of the elements in their valence shells are: $B: 2s^2 2p^1$ $C: 2s^2 2p^2$ $N: 2s^2 2p^3$ $O: 2s^2 2p^4$ Ionization potential generally increases across a period from left to right. However,$N$ has a stable half-filled $p$-orbital configuration $(2p^3)$,which requires more energy to remove an electron compared to $O$ $(2p^4)$. Thus,the order of first ionization potential is $B Therefore,$N$ has the maximum first ionization potential.

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