Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O2−,S2−,N3−,P3−

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Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species $O^{2 -}, S^{2 -}, N^{3 -}, P^{3 -}$

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$O^{2 -} < N^{3 -} < S^{2 -} < P^{3 -}$

$N^{3 -} < O^{2 -} < P^{3 -} < S^{2 -}$

$O^{2 -} < P^{3 -} < N^{3 -} < S^{2 -}$

$N^{3 -} < S^{2 -} < O^{2 -} < P^{3 -}$

answer is A.

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Detailed Solution

Nitrogen and oxygen belong to Period 2. Phosphorus and sulphur belong to Period 3. In the same period, larger the negative charge on the ion, larger is its size. But their sizes are smaller than the corresponding element in the next higher period. Thus, the expected sizes will be $O^{2 -} < N^{3 -} < S^{2 -} < P^{3 -}$