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JEE Main202118 Mar 2021Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The ionic radius of Na + ions is 1 . 02 A ° . The ionic radii (in A ° ) of Mg 2 + and Al 3 + , respectively, are

Options

  1. A1 . 05 and 0 . 99
  2. B0 . 72 and 0 . 54
  3. C0 . 85 and 0 . 99
  4. D0 . 68 and 0 . 72

Correct answer

B. 0 . 72 and 0 . 54

Step-by-step solution

As we know nuclear charge increases, attraction of nucleus on electron increases because of that size decreases. Here all ions have same number of electrons so as the number of protons increases nuclear charge increases and size decreases. The ionic radii order is Na + > Mg 2 + > Al 3 +

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