Identify correct decreasing order of ionic radii of lanthanoids.

Identify correct decreasing order of ionic radii of lanthanoids.
  1. $\mathrm{Sm}>\mathrm{Gd}>\mathrm{Ce}>\mathrm{Pm}$
  2. $\mathrm{Gd}>\mathrm{Pm}>\mathrm{Ce}>\mathrm{Sm}$
  3. $\mathrm{Ce}>\mathrm{Pm}>\mathrm{Sm}>\mathrm{Gd}$
  4. $\mathrm{Pm}>\mathrm{Sm}>\mathrm{Ce}>\mathrm{Gd}$

Solution

Along the lanthanoid series, there is a decrease in ionic radii.

Asked in: MHT CET 2020 (14 Oct Shift 1)

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