Which one of the following has the largest ionic radius?

For isoelectronic species (ions/atoms with the same number of electrons), the ionic radius is inversely proportional to the atomic number ($$Z$$).

As the nuclear charge increases, the attraction on the electrons increases, causing the ionic radius to decrease.

Therefore, atomic radii: $$O^{2-} > F^- > Li^+ > B^{3+}$$

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