Answer: Option (c) is the correct answer.
Explanation:
More is the number of electrons present in an atom more will be its atomic size.
Atomic number of fluorine is 9 which means in neutral state a fluorine atom has only 9 electrons.
But when one electron is gained by a neutral fluorine atom then it changes into [tex]F^{-}[/tex] ion and there will be a total of 10 electrons in it.
On the other hand, atomic number of chlorine is 17 which means in neutral state a chlorine atom has only 7 electrons.
And, when this neutral chlorine atom gains an electron then it will form [tex]Cl^{-}[/tex] ion. Hence, total number of electrons present in a [tex]Cl^{-}[/tex] ion is 18.
Therefore, a [tex]Cl^{-}[/tex] ion has more number of electrons that is, 18 out of the given species.
Thus, we can conclude that atomic radius of [tex]Cl^{-}[/tex] ion is the largest.
