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NEET2015ChemistryClassification of Elements and Periodicity in PropertiesActual

The species A r ,   K + and C a 2 +   contain the same number of electrons. In which order do their radii increase?

Options

  1. AA r < K + < C a 2 +
  2. BC a 2 + < A r < K +
  3. CC a 2 + < K + < A r
  4. DK + < A r < C a 2 +

Correct answer

C. C a 2 + < K + < A r

Step-by-step solution

For isoelectronic species as z e ratio increases ionic size decreases. (Total no. of electrons) = 18 For A r z e = 18 18 K + z e = 19 18 C a 2 + z e = 20 18 i.e. C a 2 + &#60; K + &#60; A r &#160;

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