Question

The properties of $Zr$ and $Hf$ are same because

• A. they have similar radii
• B. they belong to d-b;ock
• C. they have same valence electrons
• D. None of the above

Answer 1

Answer: (A)

they have similar radii

It is because of lanthanide contraction die to which ionic radii os econd and third transition series are same, thus properties of $Zr$ and $Hf$ are same as they have similar radii

${Zr}^{4+}\left(40\right)79pm$

${Hf}^{4+}\left(72\right)(78pm$