In the P 3 − , S 2 − and Cl − ions, the increasing order of size is

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

ChemistryStructure of AtomAIIMSAIIMS 2018 (27 May)

Options:

A $\mathrm{S}^{2-} < \mathrm{Cl}^{-} < \mathrm{P}^{3-}$
B $\mathrm{Cl}^{-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}$
C $\mathrm{S}^{2-} < \mathrm{P}^{3-} < \mathrm{Cl}^{-}$
D $\mathrm{P}^{3-} < \mathrm{S}^{2-} < \mathrm{Cl}^{-}$

Solution:

2597 Upvotes Verified Answer

The correct answer is: $\mathrm{Cl}^{-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}$

In isoelectronic species, the size of ions increases as negative charge increases. Therefore, $\mathrm{Cl}^{-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}$.

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