Transition and InnerTransition Elements - Result Question 8

Answer:

Correct Answer: 8. (c)

Solution:

The correct order of atomic radii is

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Note

(i) $N$ being the member of $p$-block and second period, have the smallest radii.

(ii) Rest of all the 3 members are lanthanides with Eu having stable half-filled configuration thus with bigger size than rest two.

(iii) Among $Ce$ and $Ho$, $Ce$ has larger size which can be explained on the basis of “Lanthanoid contraction”.