Chapter 21, Problem 24E

Interpretation Introduction

Interpretation:

The saw tooth variation across the lanthanide series on the basis of atomic number is to be explained.

Concept introduction: In the periodic table, a series of elements which are metallic in nature belongs to group 3 is known as lanthanide series. It includes the rare earth metals and involved the filling of $\text{4f}$ orbitals in their elements and belongs to f block in a periodic table. Hence, lanthanide series is also called as $\text{4f}$ series. The ionic radii of lanthanides decrease on moving across a period which is greater than expected decrease due to lanthanide contraction.

To determine: The saw tooth variation across the lanthanide series on the basis of atomic number.