Verified Solution • 2025–26 Session
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QJEEM19Chcb3f: JEE Main 2019 Chemistry - Class 12 JEEM19Chcb3f Solution: The pair that has similar atomic radii is :
The pair that has similar atomic radii is :
Multiple Choice Options
- A Mo and W
- B Mn and Fe
- C Ti and Hf
- D Sc and Ni
Step-by-Step Verified Solution
Electron configuration of Mo(Molybdenum) = [Kr] 4d5 5s1. So it belongs to 4d series.
Electron configuration of W(Tungsten) = [Xe] 4f14 5d4 6s2. So it belongs to 5d series.
Size of 3d < 4d = 5d. Due to lanthanoid contraction size of 4d and 5d series elements are almost same.
Electron configuration of W(Tungsten) = [Xe] 4f14 5d4 6s2. So it belongs to 5d series.
Size of 3d < 4d = 5d. Due to lanthanoid contraction size of 4d and 5d series elements are almost same.