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JEE Main202227 Jun 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of ionic size of N 3 - , Na + , F - , Mg 2 + and O 2 - is :

Options

  1. AMg 2 + < Na + < F - < O 2 - < N 3 -
  2. BN 3 - < O 2 - < F < Na + < Mg 2 +
  3. CF - < Na + < O 2 - < Mg 2 + < N 3 -
  4. DNa + < F - < Mg 2 + < O 2 - < N 3 -

Correct answer

A. Mg 2 + < Na + < F - < O 2 - < N 3 -

Step-by-step solution

These are all isoelectronic species. More the negative charge on the species, more is the size of that ion and more the positive charge on the species, less is the size of that ion. The correct order of ionic radii is N - 3 > O - 2 > F - > Na + > Mg + 2 Radii (Isoelectronic species)

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