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Said that everything had to made up of something and they have to atoms
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Rejected the concept of the atom
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Found the elements Carbon, hydrogen, and oxygen
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Stated the law of definite proportions
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Said that all matter is composed of small particles called atoms. All atoms of a given element are identical, having the same size, mass, and chemical properties
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Avogadro hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
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Discovered thallium
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identified a simpler way to detect radio waves
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Discovered rays that could travel through solid wood and flesh
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Discovered the electron
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Founder of the quantum Theory
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Discovered radioactivity through his investigations of uranium and other substances
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Measured the charge of an elevtron
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Discovered the Neutron
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Discovered the wavelength of an x-ray becomes shorter as the atomic weigh increases
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Explained the photoelectric effect
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Explained what happens in an atom. Created a picture of the atomic structure
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Combined the equations for the behavior of eves with the De Broglie equation to come up with the mathematical model for the distribution of electrons of an atom
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Discovered the wave mechanics theory
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Discovered the theory of quantum mechanics and its applications. resulted in the discovery of allotropic forms of hydrogen
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