Here's why:

* Protons: These are positively charged particles located in the nucleus of an atom. The number of protons defines the element. For example, all carbon atoms have 6 protons.

* Electrons: These are negatively charged particles that orbit the nucleus in shells or energy levels.

* Neutrons: These are neutral particles (no charge) also found in the nucleus. The number of neutrons can vary within an element, creating isotopes.

Important Note: The number of protons and electrons are equal in a neutral atom. This ensures that the atom has an overall neutral charge. If an atom loses or gains electrons, it becomes an ion with a positive or negative charge.