JEE Main 2019 — D And F Block Elements Question with Solution
From: JEE Main 2019 (Online) 12th April Evening Slot
Question
The pair that has similar atomic radii is :
Choose an option
Show full solutionCorrect option: A
Correct answer
AMo and W
Step-by-step explanation
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.
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