Transition and InnerTransition Elements - Result Question 8
8. The correct order of atomic radii is
(2019 Main, 12 Jan II)
(a) $Ho>N>Eu>Ce$
(b) $N>Ce>Eu>Ho$
(c) $Eu>Ce>Ho>N$
(d) $Ce>Eu>Ho>N$
Show Answer
Answer:
Correct Answer: 8. (c)
Solution:
The correct order of atomic radii is
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”.
BETA
