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Quick Answer. The three parts of an atom are the protons, neutrons and electrons. Atoms make up the basic building blocks of matter and define the structure of elements. These parts were not officially identified until 1932.
Share. Atom Definition: An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons orbiting this nucleus. Atom Examples: hydrogen, carbon-14, zinc, cesium, Cl - (a substance can be an atom and an isotope or ion at the same time). By Anne Marie Helmenstine, Ph.D.