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NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

The set representing the correct order of ionic radii is

Options

  1. ALi +   >   Be 2+   >   Na +   >   Mg 2+
  2. BLi +   >   Na +   >   Mg 2+   >   Be 2+
  3. CMg 2+   >   Be 2+   >   Li +   >   Na +
  4. DNa + > Li + > Mg 2+ > Be 2+

Correct answer

D. Na + > Li + > Mg 2+ > Be 2+

Step-by-step solution

2 + charge cation is smaller in size than 1 + charge cation due to more effective nuclear charge. Na + > Li + (down the group) Mg 2+ > Be 2+ (down the group)

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