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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.
In the next two sub-units you will learn about what a material composed of only one type of atom is called and you will look at the basic model of an atom. Review. 1  All matter is composed of atoms.  A molecule is a group of atoms bunched together.