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

The correct option is : (a) inversely proportional to effective nuclear charge 

Explanation:

Ionic radius in the n^th orbit is given by

Where n is principal quantum number, a₀ the Bohr's radius of H-atom and Z* , the effective nuclear charge.