Compare an atom and its subatomic particles.

Particles that are smaller than the atom are called subatomic particles. The three main subatomic particles that form an atom are protons, neutrons, and electrons. The center of the atom is called the nucleus.

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Atom - the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically charged particles.

Subatomic Particles - these particles make up the atom, they are often referred to as subatomic particles; are smaller than the atom.

Three main subatomic particles found in an atom:

Protons - Positively charged subatomic particles that reside in the nucleus.
Neutrons - Neutrally charged subatomic particles that reside in the nucleus.
Electrons - Negatively charged subatomic particles found in the electron shells surrounding the nucleus.