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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.
The nucleus of an atom is its central body, holding particles called protons and neutrons. The number of protons in the nucleus is the atomic number of the element; for example, a helium atom always has two protons, and carbon always has six. Different numbers of neutrons for the same element make atomic cousins called isotopes.