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JEE Main201912 Jan 2019Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of atomic radii is:

Options

  1. ACe>Eu>Ho>N
  2. BN>Ce>Eu>Ho
  3. CHo>N>Eu>Ce
  4. DEu>Ce>Ho>N

Correct answer

D. Eu>Ce>Ho>N

Step-by-step solution

As the number of electrons are increased it increases the radius of the element. As the number of protons are increased the radius is decreased. As we can see: Radius of : Eu = 199   pm Ce = 183   pm Ho = 176   pm N = 170   pm

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