Ionic radii vary in :

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inverse proportional to the effective nuclear charge

inverse proportional in the square of effective nuclear charge

direct proportional to the square of screening effect

direct proportional to the screening effect

answer is A, C.

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Detailed Solution

Ionic radii and effective nuclear charge are inversely related because as radii rise, nuclear attractions weaken over time.
Ionic radii and the screening effect are inversely correlated. More orbitals will be involved and there will be more filtering as the radius increases.

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