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Democritus discovered the atom in the late 1600's.
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Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
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Thomson used a CRT to expirementaly determine the charge to mass ratio.
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studied rasiations emiited from uranium and thorium and named them "Alpha" and "Beta."
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He used the idea of quanta (discrete units of energy) to explain hot glowing matter.
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Published the famous equation:E=mc 2
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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Using alpha particles discovered a neutral atomic particle with a mass close to a proton. which means he discoved the neutron.