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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 Atom. Atoms are made of three different things: protons, neutrons and electrons. The protons and neutrons are held together in the centre of the atom to form an object called the nucleus. The electrons can be found circling the nucleus at different distances from it. Chemical reactions involve the atom's electrons - mainly because these are on the outside of the atom and are the first thing that another atom will meet when it reacts with it.