Chapter 5, Problem 91E

Interpretation Introduction

Interpretation:

The reason corresponding to the fact that the ionization energy for the alkali metals is less than the ionization energy for the alkaline earth metals is to be explained.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic numbers. In the modern periodic table, the horizontal rows are known as periods and vertical columns are known as groups. There are $7$ periods and $18$ groups in modern periodic table.