Q. The radii $F,F^{-},\ O\ and\ O^{2 -}$ are in the order of
A) $F^{-} > O^{2 -} > F > O$
B) $F > F^{-} > O > O^{2 -}$
C) $O^{2 -} > F^{-} > O > F$
D) $F > O > F^{-} > O^{2 -}$
Explanation
(c)
Atomic radius decreases on going from left to right in a period. Thus, size of $O > F.$ As $O^{2 -}$ and $F^{-}$ are isoelectronic, therefore size of $O^{2 -} > F^{-}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.