Question

# Ionic radii are [CBSE AIPMT 2004]

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

Solution

## The correct option is B inversely proportional to effective nuclear charge Ionic radii∝1Zeff Zeff → effective nuclear charge. This 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.Chemistry

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