Ionic radii are:

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inversely proportional to the square of effective nuclear charge

directly proportional to the effective nuclear charge

inversely proportional to the effective nuclear charge

directly proportional to square of effective nuclear charge

answer is A.

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Detailed Solution

The radius of the ion depends on the effective nuclear charge, more the charge, more heavily the electrons are attracted towards the center and the lesser in the size. Hence the ionic radii are inversely proportional to effective nuclear charge, i.e. Option is A.

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