What are atoms made up of?

Explanation

**Step-by-Step Solution:**

1. **Understanding Atoms**: Atoms are the basic building blocks of matter. They are the smallest units of an element that retain the properties of that element.

2. **Components of Atoms**: Atoms are made up of smaller particles known as sub-atomic particles. The three main types of sub-atomic particles are:
- **Protons**: These are positively charged particles found in the nucleus of the atom.
- **Electrons**: These are negatively charged particles that orbit around the nucleus.
- **Neutrons**: These are neutral particles (having no charge) that are also found in the nucleus alongside protons.
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