Question

The properties of Zr and Hf are similar because
a) both have same atomic radii
b) both belong to d block
c) both belong to same series
d) both have same number of electrons

Answer 1

Hola mate !! ✌️✌️

here's your answer ...⬇️⬇️

▶️its ... A.

the atomic radii of Zr and Hf are same due to lanthanoid contraction . hence their properties are also same .

hope it helps !! ❤️❤️

Answer 2

Hey Dear,

● Answer -

(a) both have same atomic radii

● Explanation -

• Due to shielding effect, Zr and Hf have similar atomic atomic radii & same electronic configuration.
• Therefore, these two elements have similar like properties chemical behavior, lattice energies, etc.
• This phenomenon is called lanthanide contraction. And Zr & Hf are called chemical twins.

● Lanthanide contraction -

• Lanthanide contraction is the steady decrease in the size of the atoms and ions of the rare earth elements with increasing atomic number from lanthanum (atomic number 57) through lutetium (atomic number 71).

Hope this helps you. Thanks for asking.