Q.

Ionic radius is :

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a

inversely proportional to effective nuclear charge

b

inversely proportional to square of effective nuclear charge

c

directly proportional to effective nuclear charge

d

directly proportional to square of effective nuclear charge

answer is A.

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Detailed Solution

Ionic radius ∝1Zeff Zeff = effective nuclear charge Zeff  is calculated as follows: Zeff =Z− screening constant (σ)This value of screening constant is based upon the number of electrons in valence shell as well as in penultimate shells.
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Ionic radius is :