Question

Among the following species, which one has the largest size: $N{a}^{+},Ne,F^{-}$

• A. $Ne$
• B. $F^{-}$
• C. $N{a}^{+}$
• D. All are equal

Answer 1

The correct option is B $F^{-}$

$N{a}^{+},Ne\text{and}{F}^{-}$ all have same number of electrons that is $10$. But they have different number of protons. $F^{-}$ has $9$ protons, $Ne$ has $10$ protons and $N{a}^{+}$ has $11$ protons. Since $F^{-}$ has lowest number of nuclear charge, it will have largest size