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Proposed that elements consisted of atoms that were identical and had the same mass. Also 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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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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found that the nucleus aslo included uncharged, or neutral particles, which he called neutrons. He reasoned that the neutrons were important in holding the positively charged protons together.
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describes a cloud-like region where the electron is likel to be found
