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.

$B$	$801$
$Al$	$577$
$Ga$	$579$
$In$	$558$
$Tl$	$589$

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The first ionization enthalpy values (in $kJ\,mol^{-1}$) of group $13$ elements are :

$B$ $801$

$Al$ $577$

$Ga$ $579$

$In$ $558$

$Tl$ $589$

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