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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.