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In 400 B.C. he said that was composed of small particles called atoms.
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Lavoisier VideoIn the 100's he made measurements of a chemicle in a sealed container. He came up with the Law of Conservation of Mass (Matter). This states that matter can't be created or destroyed.
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He came up with the Law of Definite Proportion, which said that a compound will always have the same composition regardless of their source.
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He is considered to the father of atomic theory. He came up with the Law of Multiple Proportion. It states that combinations of the same elements can have different compunds.
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Cathode rayHe did an experiment with a cathode ray and he developed the "Plum pudding" model of the atom.
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Oil Drop experimentHe performed the Oil Drop experiment, and found that the mass of an electron was equal to 0.
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Gold foil ExperimentHe came up with the Gold Foild Experiment and concluded that atoms must be mostly empty space and the have to have a small, dense center called the nucleus.
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He discovered the neutron, and he said that it had a mass of 0.
