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Q.

The smallest ion of the following :

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a

$P^{3 -}$

b

$S b^{3 -}$

c

$N^{3 -}$

d

$B i^{3 -}$

answer is A.

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Detailed Solution

As you move down a group, the ionic radius increases. This is because each period adds a new electron shell.

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The smallest ion of the following :