Question

which would have the larger radius?
f
f

Explanation:

When an atom gains an electron to form an anion (\(F^-\)), the electron - electron repulsion increases. Since the number of protons (which provide the positive charge to attract electrons) remains the same (for \(F\) and \(F^-\), the atomic number \(Z = 9\)), but the number of electrons increases from \(9\) (in \(F\)) to \(10\) (in \(F^-\)). The increased electron - electron repulsion causes the electrons to spread out more, resulting in a larger ionic radius for \(F^-\) compared to the atomic radius of \(F\).

Answer:

\(F^-\)