Chapter 7.2, Problem 2MI

Summary Introduction

To define:

The given word “ion” using the book or dictionary.

Introduction:

All things are made of atoms and molecules, but only in living things atoms and molecules are organized into cells. Atoms are neutral; that is they do not have any electrical charge. For an atom to be stable, the outermost energy level must be either empty or completely filled. Some atoms tend to gain or lose electrons in order to empty or fill the outer energy level to become stable.

Answer to Problem 2MI

Ion is a group of atoms with a positive or a negative electric charge.

Explanation of Solution

An atom that has lost or gained one or more electrons becomes an ion and carries electric charge. For example sodium has one electron in its outermost shell. It can become stable by losing one electron leaving its outermost energy level empty. When it gives away one negative charge, the neutral sodium atom becomes a positively charged sodium ion (Na⁺).