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In 400BC he coined the concept of the "atom" meaning inseperable. (time toast doesn't support BC, sorry about inacurate dates)
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Pioneered work on the atomic theory.
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JJ Thomson discovered electrons and said they were mixed in the atom like "plum pudding".
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He received a nobel peace prize on atomic structure.
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He created a model for atoms, and described the insides of them.
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He made an important discovery of the neutrons in atoms.
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Currently we use all the research from James Chadwick, but we use Ernest Rutherford's model. We learned many things from these men that support this theory, such as: protons, neutrons, and elctrons.
