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(B) $1$. For $Al^{3+}, Mg^{2+}, Na^{+}, F^{-}$,all are isoelectronic species with $10$ electrons. The size decreases as the nuclear charge $(Z)$ incre

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Increasing $I.E._1 : B < C < O < N$

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(B) $1$. For $Al^{3+}, Mg^{2+}, Na^{+}, F^{-}$,all are isoelectronic species with $10$ electrons. The size decreases as the nuclear charge $(Z)$ increases. Thus,$F^{-} (Z=9) > Na^{+} (Z=11) > Mg^{2+} (Z=12) > Al^{3+} (Z=13)$. The given order is correct.$2$. For $I.E._1$ in the second period: $B  O$ due to stable configuration. The given order $B  O$.$3$. For $E.A._1$: The order is $I $4$. For metallic radius: Down the group,size increases. $Li Therefore,option $B$ is the incorrect order.

In which of the following arrangements,the order is not correct according to the property indicated against it?

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