Assertion (A) : The ionic radii of $\mathrm{Na}^{+}$and $\mathrm{F}^{-}$are same.

Reason (R) : Both $\mathrm{Na}^{+}$and $\mathrm{F}^{-}$are isoelectronic species.

The correct answer is

In which of the following ionic pairs, second ion is smaller in size than the first ion?

In which of the following species, the ratio of $s$-electrons to $p$-electrons is same?

Identify the pair of elements in which the difference in atomic radii is maximum