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work cited Democritus discoverd the atomic theory. He basically came up with the idea that everything is made up of atoms.
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work cited John Dalton was one of the first people to discover the behavior of the atom and how it reacts.
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work citedJ.J Thompson discovered the electron.
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work cited he discovered the proton
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work citedHe discovered the neutron
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work cited Bohr made the previous model better and gave a better understanding of the atom.
