In which of the following pairs are both spec | vedclass

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(C) Isoelectronic species are those that have the same number of electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge

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$F^{-}, Na^{+}$

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(C) Isoelectronic species are those that have the same number of electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge (number of protons) increases.In option $C$,both $F^{-}$ and $Na^{+}$ have $10$ electrons.$F^{-}$ has $9$ protons,while $Na^{+}$ has $11$ protons.Since $F^{-}$ has fewer protons to attract the same number of electrons,it has a larger ionic radius than $Na^{+}$.Therefore,$F^{-}$ is larger than $Na^{+}$.

In which of the following pairs are both species isoelectronic,but the first one is larger in size than the second?

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