A) Directly proportional to effective nuclear charge
B) Directly proportional to square of effective nuclear charge
C) Inversely proportional to effective nuclear charge
D) Inversely proportional to square of effective nuclear charge.
Correct Answer: C
Solution :
[c] Ionic radius in the \[{{n}^{th}}\]orbit is given by \[{{r}_{n}}=\frac{{{n}^{2}}a}{z}\]or \[{{r}_{n}}\propto \frac{1}{Z}\] Where n is principal quantum no., \[{{a}_{0}}\]is Bohar's radius of hydrogen atom and Z is the effective nuclear energy.
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