Which ion has the largest ionic radius?

{C l}^{-}

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{N a}^{+}

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P^{3 -}

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{M g}^{2 +}

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Solution

The correct option is C $P^{3 -}$
${N a}^{+}$ & ${M g}^{2 +}$ are iso electronic with Ne and ${C l}^{-}$ & $P^{3 -}$ are iso electronic with Ar. Ne is smaller than Ar. So, ${N a}^{+}$ & ${M g}^{2 +}$ are smaller than ${C l}^{-}$ & $P^{3 -}$ . Now, $P^{3 -}$ is larger than ${C l}^{-}$ as it has less protons hence force of attraction is less on $P^{3 -}$ compared to ${C l}^{-}$ . Hence $P^{3 -}$ is largest among mentioned options.

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Similar questions

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