F⁻ has a larger radius than F because an additional electron causes greater repulsion in F⁻.
Explanation: When an additional electron is added to a fluorine atom (F) to form the fluoride ion (F⁻), the electron-electron repulsion increases. This increased repulsion causes the electron cloud to expand, resulting in a larger atomic radius for F⁻ compared to F. Therefore, F⁻ has a larger radius than F due to the greater repulsion caused by the additional electron.