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${Na}^{+}$

${Cs}^{+}$

$F^{-}$

${Cl}^{-}$

answer is B.

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Detailed Solution

Given: Ions - ${Na}^{+}$ , ${Cs}^{+}$ , $F^{-}$ , ${Cl}^{-}$

Atomic size In a period from left to right decreases and in a group from top to bottom increases due to in a group differentiating electron enters in to new shell so CS⁺is large size.

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