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 p m and Hf = 159 p m, Zr^(4+) = 79 p m and Hf^(4+) = 78 p m.`.
Therefore, these two elements show similar properties (physical and chemical properties).