Q. 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
Explanation
(a)
Ionic radii $\propto \frac{1}{Z_{eff}}$
$Z_{eff} =$Effective nuclear charge
This $Z_{eff}\ is\ calculated\ as\ follows$
$Z_{eff}$=Z$-$screening constant $(\sigma)$
The value of screening constant is based upon the number of electrons in valence shell as well as in penultimate shells.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.