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This is when the Greeks thought the atoms were small particles. They came up with the word "atomos" which means indivisible. (cannot be divided.)
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Dalton thought the atom was a sphere that was the same throughout.
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Thompson proved the exsistance of an electron.
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Crookes make the cathode ray tubes.
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Rutherford discoved the nucleus while shooting the alpha-particles at the gold foil.
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Bohr said that the electrons are in orbit, or energy levels around the nucleus.
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