Question

The correct order of ionic radii among the following is:

• A. $T{i}^{4+}<M{n}^{7+}$
• B. ${}^{35}C{l}^{-}{<}^{37}C{l}^{-}$
• C. $K^{+}>C{l}^{-}$
• D. $p^{3+}>p^{5+}$

Answer 1

The correct option is D $p^{3+}>p^{5+}$

Ionic radii of $P^{3+}>P^{5+}$

More is the positive charge smaller the size.

$ionicradii\propto \frac{1}{charge}$

in case of $T{i}^{4+}$ & $M{n}^{7+}⟶M{n}^{7+}$ will be smaller

In ${}^{35}C{l}^{-}$ and ${}^{37}C{l}^{-}⟶$ ionic radii remains same for both.

as no. of $e^{-}$ & no. of $p^{+}$ remains same in $K^{+}$ and $C{l}^{-}$, $K^{+}$ will be smaller as cations are smaller in size than anions.

Hence answer is $D$.