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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.
Quick Answer. An atom is the basic unit of matter. The atom is the basic building block of an element, and cannot be broken down further using any chemical means. An atom is made up of three particles: protons, neutrons and electrons. Continue Reading.