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Stated elements had particles that combined in simply ways. Discovered atoms.
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Led to understanding of atoms molecular weight
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Developed system for visualizing the structure of organic molecules
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Found three elements that were unknown at the time
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He stated atoms where not simply solid spheres. Discovered electrons
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Stated electrons existed in shells around the nucleus
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Stated most atoms are made of space.
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Stated electrons orbited nucleus in energy levels
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