Transition and InnerTransition Elements - Result Question 2
2. The pair that has similar atomic radii is
(a) Mn and Re
(b) Ti and $Hf$
(c) $Sc$ and $Ni$
(d) Mo and W
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Answer:
Correct Answer: 2. (d)
Solution:
The pair that has similar atomic radii is Mo and W. It is due to lanthanoid contraction. The factor responsible for lanthanoid contraction is the imperfect shielding of one electron by another in the same set of orbitals. Shielding of $4 f$ is very less due to its diffused shape. As a result, nuclear charge increases. Hence, Mo and $W$ have similar atomic radii.
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