Q46 / 200 · NEET 2004 · Chemistry

Ionic radii are:

  • Correct answer
    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

Solution

Ionic radius in the $n^{\text {th }}$ orbit is given by $$ r_n=\frac{n^2 a_0}{\mathrm{Z}} \text { or, } r_n \propto \frac{1}{\mathrm{Z}} $$ Related Theory The radius of the ion depends on the effective nuclear charge, more the charge, more heavily the electrons are attracted towards the centre and lesser in the size.

Hence, the correct answer is option: 'A'.

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