Question

The identical size of zirconium and halfnium due to

Answer 1

Answer:

Lanthanoid contraction

Explanation:

Zr and Hf have almost identical size because of lanthanoid contraction which occurs in certain pairs of lanthanoids

Answer 2

Explanation:

Zr and Hf have almost identical atomic radii due to lanthanoid contraction. Hf is post lanthanoid element. As a result of lanthanoid contraction, the atomic size of Hf is similar to Zr (element of previous period).