MCQ
The radii of $F, F^-, O$ and $O^{2-}$ are in the order of :-
- ✓$O^{2-} > F^-> O > F$
- B$O^{2-} > F^-> F > O$
- C$F^-> O^{2-} > F > O$
- D$O^{2-} > O > F^-> F$
✓
Answer
Correct option: A.
$O^{2-} > F^-> O > F$
a
As we move along a row, radius decreases and as we move down the group, radius increases.
As we move along a row, radius decreases and as we move down the group, radius increases.
As a particular atom gains an electron, size increases due to inter-electronic repulsions. So, order is $O^{-}>F^{-}$
Thus, $O^{2-}>O^{-}>F^{-}>F$
Hence, option A is correct.
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