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Theorized a mechanical universe with small, solid masses in motion.
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Proposed an 'atomic theory' with spherical solid atoms, and that elements consisted of atoms that were identical and had the same mass.
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Created the first periodic table.
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Determined the charge to mass ratio of electrons.
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Discovered the alpha, beta, and gamma rays in radiation.
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Proposed an atomic model called the Saturnian Model to describe the structure of an atom.
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Discovered that inert gases had a stable electron configuration which led to their chemical inactivity.
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Performed the gold foil experiment to come to a conclusion that atoms were mainly empty space and they had a dense core, called the nucleus.
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Proposed an atomic theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.
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Discovered neutrons, particles whose mass was close to that of a proton.
