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Thought atoms were just spheres.
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John Dalton like Democritus thought everything was made up of atoms and that atoms could join together to make compounds.
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Nelis Bohr found out that electrons dont just fly around randomly but instead occupied energy levels.He also created the Atomic Bomb.
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J.J. Thomson discovered electrons and noticed that an atom can be divided.He also came up with the Plum Pudding atomic model.