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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.
Neutrons are particles of an atom present inside the nucleus of an atom. They possess no charge. Protons are positively charged particles which are also a part of the nucleus. Electrons are negatively charged particles that revolve around specific orbits ( more likely as planet revolve around the sun).