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Democritus found out that everything is amde out of smaller particels called atoms.
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Dalton developed his theory of atoms and matter.
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JJ Thomson discovered the Electron, by experimenting using electric charges.
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Rutherford developed the planetary model of the atom. He made the first atomic model.
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Bohr developed another model of the atom and used laws of quantum physics to make a updated model.
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Chadwick was the one to complete the atomic model, by discovering Neutrons.
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