Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because …….. .

Options

A. both belong to d-block
B. both have same number of electrons
C. both have similar atomic radius
D. both belong to the same group of the Periodic Table

Answer

C

Explanation

Due to lanthanoide contraction, Zr and Hf possess nearly same atomic and ionic radii i.e., Zr = 160 pm and Hf = 159 pm , `Zn^(4+)` = 79 pm and `Hf^(4+)` = 78 pm. Therefore these two elements show similar properties (physical and chemical properties).