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He thought that you would eventually end up with a particle that can not be cut, He called this particle"atom."
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He disagreed with Democritus. He thought you would never get down to a particle you could not cut. He was incorrect
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He thought that all substances are made up of atoms. Atoms of the same element are exactly alike. Atoms can join with others to make new substanes.
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His theory showed mistakes in Dalton's theory. Discovered small particles inside the atoms. He discovered negatively charged particles and called them elecrons. (Plums in the plum pudding)
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Futher explained the movement of electrons in the atom. Electron Clouds
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He did the Foil experiment
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He proposed that in the center of the atom was a tiny, extremely dense, positively charged part called the nucleus.
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He proposed that the electrons move around the nucleus in certain paths, or enery levels
