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  4. In which of the following ionic radii of chromium would be smallest

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Q. In which of the following ionic radii of chromium would be smallest

The d-and f-Block Elements

Solution:

Oxidation number of $Cr$ in options $a, b, c $ and d are $+6, +4, + 3, + 3$ respectively. In given options, (a) has high oxidation number therefore its radii will be less. Atomic radii decreases with increase in oxidation no.