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"by convention bitter, by convention sweet, but in reality atoms and void" Something filled the void between all matter. Thus creating atoms.
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Proposed a mechanical universe with small solid masses in motion.
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Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
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Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law.
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Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram. Also, Studied "canal rays" and found they were associated with the proton H +.
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Studied radiations emitted from uranium and thorium and named them alpha and beta.
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Published the famous equation E=mc 2 Means that Energy is equal to Mass times the speed of light squared. No object with mass can ever go faster than the speed of light.
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Oil drop experiment determined the charge (e=1.602 x 10 -19 coulomb) and the mass (m = 9.11 x 10 -28 gram) of an electron.
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Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.
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Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron.
