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AP EAMCET201825 Apr 2018Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

In lanthanides, with increase in atomic number atomic radius decreases, except for the element X ¯ . What is X ¯ ?

Options

  1. AGd
  2. BEu
  3. CTm
  4. DDy

Correct answer

B. Eu

Step-by-step solution

In lanthanide, 4 f   orbital has poor shielding effect therefore, size decreases with increase in atomic number as we move from Ce to Lu but Eu is an exception and have the largest size among all lanthanide.

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