Question

Ionic radii are

• 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 1

Answer: (A)

Ionic radii $ \propto \frac{1}{{{Z}_{eff}}} $
$ {{Z}_{eff}}\to $ Effective nuclear charge
This $ {{Z}_{eff}} $ is calculated as follows
$ {{Z}_{eff}}=Z- $ screening constant $ (\sigma ) $
This value of screening constant is based upon the number of electrons in valence shell as well as in penultimate shells.