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NEET 2021
Exam
NEET
Year
2021
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2021 · Chemistry · d and f Block Elements

Zr ( Z = 40 ) and Hf ( Z = 72 ) have similar atomic and ionic radii...

Zr(Z=40)Zr ( Z = 40 ) and Hf(Z=72)Hf ( Z = 72 ) have similar atomic and ionic radii because of:

Options

  1. Abelonging to same group
  2. Bdiagonal relationship
  3. Clanthanoid contraction
  4. Dhaving similar chemical properties

Correct answer

C. lanthanoid contraction

Step-by-step solution

Zr(40)Zr\left(40\right) and Hf(72)Hf\left(72\right) have similar atomic and ionic radii because of Lanthanoid Contraction. The 4f4f orbital offers very poor screening. So, the radius (atomic as well as Ionic)ofZrof Zr and HfHf are almost the same.
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