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Ended in October 1781
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Most noted for his discovery of the role that oxygen plays in combustion.
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Discovered Law of Definite Proportions.
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Determined that each chemical element is composed of a unique type of atom and that the atoms differed by their masses.
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Hypothesized that equal volume of gases at the same temperature and pressure contain equal number of molecules
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Discovered cathode rays and their properties.
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Studied the effects of x-rays on photographic film.
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Studied canal rays and found they were associated with the protein H+
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Studied uranium and thorium, discovered radioactivity, discovered radioactive elements polonium and radium
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He used the idea of quanta to explain hot glowing matter.
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Published E=mc^2
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Did the oil drop experiment determined the charge and the mass of an electron.
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Using x-ray tubes determined the charges on the nuclei of most atoms.
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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.
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Decribed atoms by a formula connected to the frequencies of spectral lines. Proposed Principles of Determinacy.
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Viewed electrons as continuous clouds and introduced "wave mechanics"
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using alpha particles discovered a neutral particle with a mass close to proton this was neutron.
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Became the first clogned mammal.
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First to hypothesize that all matter is made of atoms.
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About 360 B.C. He claimed that there was no smallest part of matter and that different substances were made of different portions of fire, air, water, and earth.
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Using alpha particles as stomic bullets, probed the atoms in a piece of thin 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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