Chapter 5, Problem 5CLE

Interpretation Introduction

Interpretation:

A brief description of the relationships among periodic table, groups and periods is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in increasing order of their atomic number. There are $7$ periods and $18$ groups in a modern periodic table. They are categorized into groups based on the type of energy sublevel that the last valence electron of the element enters.