Question

The lanthanide contraction is responsible for the fact that:

• A. $Zr$ and $Hf$ have about the same radius
• B. $Zr$ and $Zn$ have the same oxidation state
• C. $Zr$ and $Y$ have about the same radius
• D. $Zr$ and $Nb$ have similar oxidation state

Answer 1

The correct option is A $Zr$ and $Hf$ have about the same radius

Due to lanthanide contraction, the elements of second and third transition series i.e., $Zr$ and $Hf$ resemble more with each other than the elements of first and second transition series