Chapter 8, Problem 90AE

Interpretation Introduction

Interpretation: The reason for the identical radii of the transition metal of period $5$ and $6$ is to be stated.

Concept introduction: The decrease in the atomic radii of the lanthanide series due to the poor shielding of f orbitals is called lanthanide contraction.

To determine: The reason for the identical radii of the transition metal of period $5$ and $6$ .