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Matter is composed of empty space through which atoms move 480 B.C.
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Rejected the atomic theory 322 BC
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Compiled a list of 23 elements
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All mater is composed of extremely small particles called atoms
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Determined the volume of one mole of gas
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Steam Engine
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Morse Code
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Potato Chips
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Discovered that phosphorescent uranium salts
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Dynamite
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Discovered cathode ray tube which made old televisions work
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Automobile
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Gas Powered Tractor
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Swiss Army Knife
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Identified the first subatomic particle - the electron
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Discovered Polonium
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Matter can gain or lose energy only in small, specific amounts called quanta.
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Assembley Line
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Flashlight
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Determined the charge of an electron = 1-
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Proposed that electromagnetic radiation has both wavelike and particle like nature's (Photon)
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Founded the nucleus
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Related the hydrogen atom’s energy states to the motion of electron within the atom
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The Heisenberg uncertainty principle states that it is fundamentally impossible to know precisely both the velocity and position of a particle at the same time.
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Saw that only whole numbers of wavelengths are allowed in a circular orbit of fixed radius
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Created an atomic model in which electrons are treated as waves called the wave mechanical model of the atom or the quantum mechanical model of the atom
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Found that the nucleus also contained a neutral particle called the Neutron.
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Telephone
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Discovered that atoms of each element contain a unique positive charge in their nuclei.
