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Discovery of electron

Discovery of electron. 1897 - J.J. Thomson (1856-1940) http://www.chemheritage.org/classroom/chemach/atomic/thomson.html http://www.aip.org/history/electron/. (Kennedy, Chemistry Live!). Mass spectrometry.

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Discovery of electron

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  1. Discovery of electron • 1897 - J.J. Thomson (1856-1940) http://www.chemheritage.org/classroom/chemach/atomic/thomson.html http://www.aip.org/history/electron/ (Kennedy, Chemistry Live!)

  2. Mass spectrometry • Sample converted to positive ions by collisions with a stream of high energy electrons on entering the spectrometer. • Charged sample is accelerated using applied voltage • Ions then passed into an evacuated tube and through a magnetic field. • Magnetic field causes ions to be deflected by different amounts depending on their mass. • Ions with the same mass-to-charge ratio hit the detector at the same spot. (Brown, LeMay and Bursten, 9th ed., p.45)

  3. Determination of electron charge Robert Millikan (1868 – 1953)

  4. Discovery of nucleus • 1911 - Ernest Rutherford (1871-1937)

  5. Quantum Theory and the Atom • Niels Bohr (1885 – 1962) http://www.pa.msu.edu/~brock/d0_homepage/physics-posted/surprises-bohr.html http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html

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