Which three particles make up atoms?

Atoms are the basic units of matter and are composed of three primary subatomic particles: protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus of the atom, while neutrons, which have no charge, also reside in the nucleus together with protons. Electrons are negatively charged particles that orbit around the nucleus in various energy levels.

This combination of particles is fundamental to the identity and properties of an element; the number of protons determines the element, while the number of neutrons can vary among isotopes of the same element. Electrons play a crucial role in chemical bonding and reactivity.

Understanding these three particles helps explain the structure and behavior of atoms, including how they interact to form molecules and compounds, which are essential concepts in biology and chemistry.