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JEE Main2018ChemistryClassification of Elements and Periodicity in PropertiesActual

For Na + , Mg 2 + , F - and O 2 - , the correct order of increasing ionic radii is:

Options

  1. AO 2 - < F - < Na + < Mg 2 +
  2. BNa + < Mg 2 + < F - < O 2 -  
  3. CMg 2 + < Na + < F - < O 2 -  
  4. DMg 2 + < O 2 - <   Na + < F -

Correct answer

C. Mg 2 + < Na + < F - < O 2 -  

Step-by-step solution

Isoelectric series: Mg 2 + < Na + < F - < O 2 - All have 10 electrons. In the isoelectronic series, the proton/electron ratio decreases, so the size decrease because Z eff increases on decrease proton/electron ratio.

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