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Proposed that the elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together.
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Determined the charge to mass ratio of electrons.
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Discovered alpha, beta, and gamma rays in radiation.
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DIvided the nucleus into protons and neutrons
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Proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.
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Describes a cloud-like region where the electron is likely to be found.
