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He figured all elements consisted of atoms.
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Believed the atom was a sphere or positive matter and electrons are placed by electrostatic forces.
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Created tge incorrect "planetary model". Believed an atom had a large nuecleus with orbiting electrons.
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like the planetary model, he believed the atoms were made up of a central charge and surrounded by a cloud of electrons. In addition, the nucleuos was smaller.
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Presented an atomic structure with chemical and physical properties of the atom.
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Proved the existance of nuetrons.
