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about 400 B.C. he was the first man to suggest that all matter was made of small pieces
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in the late 1890s he discovered that atoms are divisble into smaller particles
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determined the mass of the elctron is 1/1840 the mass of a hydrogen atom
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Ernest Rutherford discovered the proton
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he dicovered the proton and concluded that the nucleus was made up of positiviely charged particles
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discovered the neutron and that it has no charge, and is found in the nucleus
