Classification of Elements and Periodicity in Properties - Result Question 27
####27. Ionic radii are
[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
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Solution:
- (a) Ionic radii are inversely proportional to effective nuclear charge.
Ionic radii in the $n^{\text{th }}$ orbit is given as
$r_n=\frac{n^{2} a_0}{Z}$ or $r_n \propto \frac{1}{Z}$
when $n=$ principal quantum number
$Z=$ effective nuclear charge.
