Which of the following is largest?

Cl^-

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S^2-

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Na⁺

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F^-

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Solution

The correct option is B
S^2-

$S^{2 -}$ and $C l^{-}$ both are isoelectronic species but the effective nuclear charge of $C l^{-}$ is more than $S^{2 -}$ . So it has the larger size.

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