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in 1932 he Discovered the neutron by Shot particles at Be which released neutrons.

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in 1913 he discovered Electrons orbit around in energy level threw a Gold foil experiment

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in 1911 he Discovered nucleus with positive charge (due to protons); most of mass in nucleus

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in 1897 he Discovered electrons& their negative charge with a Cathode ray tube experiments

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in 1832 he Brought back atomic theory with evidence.

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In 400 B.C. he said All things made of particles (“atoms”).