Question:
The pair that has similar atomic radii is :
Correct Option: , 4
Solution:
Mo and W belong to group-6 and period 5 (4d series) and $6(5 d$ series) respectively.
Due to lanthanoid contraction, radius of Mo and W are almost same i.e. $0.140 \mathrm{~nm}$ and $0.141 \mathrm{~nm}$ respectively.
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