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JEE Main20204 Sep 2020Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The ionic radii of O 2 – , F – , Na + and Mg 2 + are in the order:

Options

  1. AF –   >   O 2 –   >   Na +   >   Mg 2 +
  2. BO 2 –   >   F –   >   Na +   >   Mg 2 +
  3. CMg 2 +   >   Na +   >   F –   >   O 2 –
  4. DO 2 –   >   F –   >   Mg 2 +   >   Na +

Correct answer

B. O 2 –   >   F –   >   Na +   >   Mg 2 +

Step-by-step solution

O 2 - F - Na + Mg 2 + Z 8 9 11 12 No. of e - 10 10 10 10 In isoelectronic species greater is Z smaller is radius so order is O − 2 > F − > Na + > Mg 2 + .

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