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The first person to propose the idea that matter was not infinitely divisible.
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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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Discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass.
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Studied "canal rays" and found they were associated with the proton H + .
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He concluded that the plum pudding model was not correct because it couldn't explain the gold foil experiment. He also said that almost all the atoms positive charge and almost all of it mass were containted in a small dense region
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Published the famous equation E=mc 2
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Discovered the existence of isotopes through the use of a mass spectrograph.
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Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality. Supported Einstein.
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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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He rejected that the notion of atoms because it did not agree with his idea of nature.
