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The Greeks thought that atoms were little particles that were indisible. They called them atomos.
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John Dalton thought that atoms were little round solid spheres.
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William Crookes developed the Cathode Ray Tube. (CRT)
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J.J, Thompson discovered little negatives and figured out that they are electrons.
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Ernest Rutherford discovered the nucleus.
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Niels Bohr discovered the explanation of the atomic structure.
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Werner Heinsenberg's theory was that all the atoms moved in a cloud. He said that electrons are unpredictable motion in the electron cloud.
