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In 460 B.C. First to propose an atomic universe
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Discovered the role oxygen plays in combustion, and made the law of conservation in 1785
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Made the atomic theory in 1803
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Arranged elements into 7 groups with similar properties, discovered that the properties of the elements were periodic functions of their atomic weights, also known as the periodic law.
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cathode-ray tubes with a perforated cathode emit a glow from the end of the tube near the cathode. used a CRT to study canal rays which had electrical and magnetic properties opposite of an electron
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Discovered electrons in 1897, also had the plum pudding atom model
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Used the idea of quanta to explain hot glowing matter
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He determined the size of the charge on an electron by doing an oil drop experiment.
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The atom consisted of subatomic particles called protons and electrons. thought the protons in the nucleus and the electrons orbited around the nucleus like planets around the sun. also with radiations emitted from uranium and thorium and named them alpha and beta
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Discoverd the nucleus and developement of an atomic model, won nobel prize in 1908
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Used x-ray tubes, determined the charges on the nuclei of most atoms, and also wrote the atomic number of an elemtent is equal to the number of protons in the nucleus
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Described atoms in means of formula connected to the frequencies of spectral liners. The principle of indeterminancy, you can not know both the postition and velocity of a particle
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Viewed electrons as continous clouds and introduced wave mechanics as a mathematical model of the atom
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Discovered the Neutron in 1932
