For each of the following pairs, choose in which option second element/ion is larger than first element/ion?

N^{3 -}, F^{-}

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{A u}^{+}, {A u}^{3 +}

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{F e}^{2 +}, {F e}^{3 +}

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{N a}^{+}, N e

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Solution

The correct option is C ${N a}^{+}, N e$
$N e$ and ${N a}^{+}$ both have same no. of electrons but ${N a}^{+}$ being a cation has smaller size than Neon. This is because the nuclear attraction over electrons increases and thus the size of the atom decreases.

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