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Brought back atomic theory and atoms based upon measurable properties of mass.
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He had the idea that the atom was just a sphere.
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He created 7 groups which he put the elements in them. He discovered that the properties of elements "were periodic functions of the their atomic weights". He discovered the Periodic Law.
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Used a CRT to study "canal rays" which had electrical and magnetic properties opposite of an electron.
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Studied "canal rays" and found they were associated with the proton H + . And used a CRT to determine the charge to mass ratio (e/m) of an electron =1.759 x 18 coulombs/grams.
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He used the oil drop experiment to determine 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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He developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of nucleus.
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Used x-ray tubes, to find the charge of the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". His work was used to change the periodic table by placement of atomic number, not mass.
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Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.
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Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality.
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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Used alpha particles and discovered the neutron
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