Lec 03 26-8-05

Lec 03 26-8-05 - II Atomic Structure A. Electrons...

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1 II Atomic Structure A. Electrons – negatively charged particles with a very small mass. 1. BLB fig 2.4 – Cathode Ray Tube 2 2. J. J. Thomson – studied cathode rays and after 20 years, declared cathode rays are particles of negative electricity. BLB fig 2.4 3 3. Robert Milliken of U. Chicago measures charge of electron as 1.60 x 10 -19 C (1909) a. BLB, fig 2.5 – Oil Drop Experiment 4 B. Radioactivity – discovered by Henri Becquerel in 1896 1. Uranium ore, known as pitchblende, spontaneously emits high energy radiation. 2. Pierre and Marie Curie – isolate the radioactive material (at Becquerel’s suggestion) http://stampmin.home.att.net/pitchblende.htm http://www.mta.gov.tr/mineral/uraninit.htm 5 3. Ernest Rutherford (1871-1937) – revealed three types of radiation α – alpha particles – positively charged. β – beta particles – negatively charged. γ – gamma particles – high energy radiation. see BLB, fig 2.8 – particles in an electrical field
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Lec 03 26-8-05 - II Atomic Structure A. Electrons...

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