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Question: Answered & Verified by Expert
The pair that has similar atomic radii is:
Chemistryd and f Block ElementsJEE MainJEE Main 2019 (12 Apr Shift 2)
Options:
  • A Mo and W
  • B Sc and Ni
  • C Mn and Re
  • D Ti and Hf
Solution:
2176 Upvotes Verified Answer
The correct answer is: Mo and W
Among the given pairs Mo and W have the same atomic radius of 139 pm and this is due to Lanthanoid contraction.
This happens due to the poor screening ability of 4f electrons. The radius of other pairs are:
Sc (162 pm) and Ni (124 pm)
Mo (139 pm) and W (139 pm)
Mn 140 pmand Re 135 pm
Ti170 pm and Hf 159 pm.

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