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Democritus found all matter is made of atoms. He hypothosized that atoms differ in size and are indestructible.
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Dalton suggested that all matter is created of atoms and that compunds are formed when you combine two or more different atoms.
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In 1904 Thomson suggested his atomic model.
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Millikan measured the charge of an electron by using his oil drop experiment.
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Bohr was the first to discover that electrons travel in different orbits.
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Rutherford was credited for splitting the first atom.
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James Chadwick discovered the nuetron.
