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Pioneered the atomic wieghts of elements
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Developed an early "planetary model" of the atom.
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Suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces.
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Discovered that atoms have thier positive charge concentrated in a very small neucleus.
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Proved the existence of neutrons in atoms.
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Investegated the structure of atoms and the radiation they eminate
