Define the following.
Molecule

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Concept of a Molecule**: A molecule is defined as the smallest unit of a substance that retains the properties of that substance.

2. **Independence of Molecules**: Molecules can exist independently, meaning they do not need to be part of a larger structure to exist.

3. **Relation to Atoms**: Molecules are made up of two or more atoms that are chemically bonded together.

...