Question

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

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

Answer 1

Answer: (B)

In isoelectronic species, the size of ions decreases as nuclear charge or atomic weight increases.

(Atomic weight of $P =30, S =32$ and $Cl =35$ ).

Therefore $Cl ^{-}< S ^{2}< P ^{3}$