Chemistry - Mole Concept Question with Solution | TestHub

When we form the ions with the nearest noble gas electronic configuration using given elements, all the ions formed are isoelectronic species(species with same number of electrons).

Among the isoelectronic species, species with more positive charge have small size and species with more negative charge are large size ions.

The ionic size order of ions is

${\mathrm{N}}^{3-}>{\mathrm{O}}^{2-}>{\mathrm{F}}^{-}>{\mathrm{Na}}^{+}$