In which of the following ionic pairs,is the | vedclass

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(B) For isoelectronic species,the size decreases as the nuclear charge (number of protons) increases. $F^{-}$ has $9$ protons and $10$ electrons. $Na^

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

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(B) For isoelectronic species,the size decreases as the nuclear charge (number of protons) increases. $F^{-}$ has $9$ protons and $10$ electrons. $Na^{+}$ has $11$ protons and $10$ electrons. Since $Na^{+}$ has a higher nuclear charge than $F^{-}$,the electrons are pulled more strongly towards the nucleus,making $Na^{+}$ smaller than $F^{-}$. Thus,in the pair $(F^{-}, Na^{+})$,the second ion is smaller than the first.

In which of the following ionic pairs,is the second ion smaller in size than the first ion?

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