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Came up with the term "atom".
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Different scientists contributions to the atomic theory
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Found out that atoms were spherical and solid
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Discovered the charge-to-mass of charged water drops
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Studied radiation that came from uranium and thorium and called them alpha and beta.
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Used the oil-drop experiment to find the weight and charge of an oil drop.
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Came up with the idea that electrons were in clouds and introduced wave mechanics
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Discovered the neutron
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Created an explanation for the way the periodic table is ordered.
