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400 BC Was the first to entertain the idea that everything was made up of small particles, called atoms.
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1649 - Discovered experimental science.
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Developed Law of Conservation of Mass
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Proposed Atomic Theory.
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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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Used a CRT to study "canal rays" which had electrical and magnetic properties opposite of an electron.
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Determined charge to mass ratio of an electron.
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Used the idea of quanta (discrete units of energy) to explain hot glowing matter.
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Chem Hujer Atom Timeline
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Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass.
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Developed explanation of atomic structure.
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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Discovered the nuetron.
