Which of the following trivalent ion has the largest atomic radii in the lanthanide series

Which of the following trivalent ion has the largest atomic radii in the lanthanide series
  1. La
  2. Ce
  3. Pm
  4. $\mathrm{Lu}$

Solution

Lanthanum is the first element of lanthanide series so size decreases with increase in atomic
number so La has the largest atomic radi. ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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