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Ernest Rutherford at Cambridge University identified the proton through nuclear transmutation experiments. By bombarding nitrogen gas with alpha particles, he discovered positively charged particles that were later named protons, completing our understanding of the basic atomic particles along with electrons and neutrons.

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James Chadwick at Cambridge University discovered the neutron by bombarding beryllium with alpha particles. This discovery completed our understanding of atomic structure by identifying the third fundamental particle, explaining atomic mass discrepancies and isotopes, and leading to advances in nuclear physics.