How does the ionic radius of a nonmetal compare radius?
The ionic radius of a non-metal SHOULD be GREATER than the atomic radius........Why?
Metals are in general electron-rich materials, and their chemistry TENDS to be reducing. Because, in general, they come from the left hand side of the Periodic Table, nuclear charge is reduced with respect to the non-metals, which come from the right of the Periodic Table as we face it.
And thus metals, especially Group 1 and Group 2 metals, TEND to be reducing. It is very easy to form
The result? When a non-metal forms an ion, it tends to do so by REDUCTION, i.e. addition of an electron to the valence shell. Both oxygen and fluorine form anions,
Anyway, I would look in your text for data: specifically ionic versus atomic radius for cations and anions and elements.