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

In lanthanides, with increase in atomic number atomic radius decreases, except for the element X¯. What is X¯ ?
  1. Gd
  2. Eu
  3. Tm
  4. Dy

Solution

In lanthanide, 4f 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.

Asked in: AP EAMCET 2018 (25 Apr Shift 1)

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