[MP PMT 1990]
A) $ C{{r}^{+3}} $
B) $ M{{n}^{+3}} $
C) $ F{{e}^{+3}} $
D) $ C{{o}^{+3}} $
Correct Answer: A
$ Ionic,\text{ radii},\propto \frac{1}{\text{Atomic No}\text{.}} $ Ionic radius decreases from left to right in a period.
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