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Discovered the electron through expirements with cathode rays. Plum Pudding Model.
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First measured the size of a charge in a single electron through his oil drop expirement.
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Discovered the atomic nucleus using a "scattering" expirement.
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Found out that electrons are in 2 different states. (Wave, Particle)
Created the Bohr model also know as Liquid Drop Model. -
Discovered Atomic number using x-rays and organized the periodic table based on Atomic Numbers.
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He discovered that each nitrogen atom contains positivily charged nuclei which are called protons.
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He created an equation that predicted the probability of the location of electrons.
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Discovered what neutrons were.
