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Unformatted text preview: ** Almost all chemistry is based on the interaction of charges seeking the lowest E DISCOVERY OF ELECTRONS 1. How do materials (and atoms) acquire charge? (Dalton = neutral atoms) 2. Thomson: cathode ray experiment. Phosphorescent Power--Screen--+ Cathode Rays + Extra Field: OFF Distance depends SMALL on charge/mass ratio LARGE Conclusions-Charged particles- Large charge/mass ratio- Large charge or really small mass could Monday, August 28, 2006 MILLIKAN: OIL-DROP EXPERMENT charge gravity +1 X-rays ionize air e- stick to drop-1-measure charge-calculate mass (from Thomson’s charge/mass)-1/1800 th of H-atom NEW MODEL OF ATOM GOALS-Compare energies at different charges at different distances-Describe the experiments that led to the discovery and mass of the e-...
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