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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.
Exploration Guide: Half-life Everything around you is made of atoms, including plants, animals, people, water,furniture and buildings. Each atom contains tiny particles called protons andneutrons in its center, or nucleus. The number of protons in the nucleusdetermines which element the atom belongs to.