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First recorded person to state that all matter is made of invisible particles called atoms.
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Went further with the atom stating all atoms as a massed form are called elements and are pure.
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Found the electron, but did not have it orbiting the nucleus.
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Studied radiation and found Uranium and Thorium.
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Found the charge and the mass of an electron.
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Created the atomic model for the orbital shell design.
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Discovered the Neutron which helped to get to today's model.
