Question

In the $P^{3-},S^{2-}\text{and}C{l}^{-}$ ions, the increasing order of size is

• A. $S^{2-}<C{l}^{-}<P^{3-}$
• B. $C{l}^{-}<S^{2-}<P^{3-}$
• C. $S^{2-}<P^{3-}<C{l}^{-}$
• D. $P^{3-}<S^{2-}<C{l}^{-}$

Answer 1

The correct option is B $C{l}^{-}<S^{2-}<P^{3-}$

Amongst isoelectronic species, ionic radii increases with increase in negative charge or decrease in positive charge.

For isoelectronic species,
$\text{-ve charge}\propto \text{Ionic radius}$

Therefore,
$C{l}^{-}<S^{2-}<P^{3-}$

Hence, option (b) is correct answer.