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Discovery And Properties, Inner Structure

The proton is a positively charged subatomic particle. Protons are one of the fundamental constituents of all atoms. Protons, in addition to neutrons, are found in a very concentrated region of space within atoms referred to as the nucleus. The discovery of the proton, neutron, and electron revolutionized the way scientists viewed the atom. Recent research has shown that protons are themselves made up of even smaller particles called quarks and gluons.

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Science EncyclopediaScience & Philosophy: Propagation to Quantum electrodynamics (QED)