Chapter 5, Problem 8CE

Interpretation Introduction

Interpretation:

The reason as to why the predictions for the number of valence electrons are only for representative elements is to be stated.

Concept introduction:

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