Question

State True or False.

Due to lanthanide contraction, $Zr$ and $Hf$ have equal size.

• A. True
• B. False

Answer 1

The correct option is A True

The given statement is true.
Due to lanthanide contraction, Zr ( 145 pm) and Hf (144 pm) have equal size.
Lanthanoid contraction refers to a gradual decrease in the atomic and ionic radii of lanthanoids with an increase in the atomic number. Due to this, the atomic radii (size) of the elements which follow lanthanum are similar to that of the elements of the previous period.