Chapter 5, Problem 7CLE

Interpretation Introduction

Interpretation:

A brief description of the relationships among atomic mass of an element, atomic mass of an isotope, and average atomic mass is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic number. The horizontal rows are known as periods, and vertical columns are known as groups. 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.