Is the radius of an ion always larger than the atomic radius of the original atom?
Absolutely not! Consider oxidation reactions of metals........
Consider oxidation reactions of the alkali metals:
We have removed the valence electron of an alkali metal. The ion, the oxidation product is MUCH smaller. TO illustrate the ionic radius of sodium ion in sodium chloride is
(Note that I use
Of course reduction of a non-metal to give an anion, will give a larger ionic radius than the atomic radius. Why so?