Chapter 7, Problem 27A

Interpretation Introduction

Interpretation: To define the valence electrons.

Concept Introduction: The valence electrons can be determined by the electronic configuration of a particular atom.

Answer to Problem 27A

The count of electrons that can be occurred in the outermost orbit of a particular atom, is named valence electrons.

Explanation of Solution

Valence electrons are said to be the total count of electrons in the outermost shell. Most chemical reactions involve valence electrons as they possess higher energy than electrons in inner orbits.

For example:

1. F-9 = ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{5}}$, valence electrons = 7
2. I − 53 = ${\text{[Ar]4d}}^{\text{10}}{\text{5s}}^{\text{2}}{\text{5p}}^{\text{5}}$ , valence electrons = 7