Question

The radii of $F,F^{-},O$ and $O^{2-}$ are in the order of

• A. O^2->F^->O>F
• B. O^2->F^->F>O
• C. F^->O^2->F>O
• D. O^2->O>F^->F

Answer 1

The correct option is A

O^2->F^->O>F

Atomic radius decreases when we go from left to right in a period due to increase in effective nuclear charge. Thus, the size of O > F.

As $O^{2-}$ and $F^{-}$ are isoelectronic, therefore, size of $O^{2-}>F^{-}$