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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". He named it 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.
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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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E=mcsquared
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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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Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.
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Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle.
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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