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JEE Main202125 Jul 2021Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The ionic radii of K + , Na + , Al 3 + and Mg 2 + are in the order :

Options

  1. ANa + < K + < Mg 2 + < Al 3 +
  2. BAl 3 + < Mg 2 + < K + < Na +
  3. CAl 3 + < Mg 2 + < Na + < K +
  4. DK + < Al 3 + < Mg 2 + < Na +

Correct answer

C. Al 3 + < Mg 2 + < Na + < K +

Step-by-step solution

Al 3 + , Mg 2 + and Na + are isoelectronic ionic species. For monatomic ionic isoelectronic species as positive charge increases ionic size decreases. The order of size of Na + &   K + is Na + < K + , ∴ Increasing order of ionic radii: Al 3 + < Mg 2 + < Na + < K +

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