Question

Ionic radii vary in
(a) inverse proportion to the effective nuclear charge
(b) Inverse proportion to the square of effective nuclear charge
(c) direct proportion to the screening effect
(d) direct proportion to the square of screening effect

Answer 1

Answers: (a) inverse proportion to the effective nuclear charge
(c) direct proportion to the screening effect

Ionic radius decreases as the effective nuclear charge increases.
Ionic radius $\propto \frac{1}{effectivenuclearcharge}$
Further, ionic radius decreases as the effective nuclear charges increases.
ionic radius $\propto$ screening effect