JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Atomic and lonic radii

  • question_answer Ionic radii are   [CBSE PMT 2003, 04]

    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 :

    Ionic radius in the nth orbit is given by \[{{r}_{n}}=\frac{{{n}^{2}}a}{z}\] or \[{{r}_{n}}\propto \frac{1}{Z}\] where n is principal equation no., ao. bohr's radius of hydrogen atom and Z is the effective nuclear energy.


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