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Models of the hydrogen atom

Models of the hydrogen atom. Why don’t electrons just spiral into nucleus? Why don’t positive charges in nucleus repel each other?. Issues with Rutherford model. Inquiring minds want to know…. James Chadwick. Neils Bohr. The big question….

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Models of the hydrogen atom

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  1. Models of the hydrogen atom

  2. Why don’t electrons just spiral into nucleus? Why don’t positive charges in nucleus repel each other? Issues with Rutherford model

  3. Inquiring minds want to know… James Chadwick Neils Bohr

  4. The big question… • What model of electrons in a hydrogen atom explains this? Electric current thru H2 gas Bands of color

  5. Predicted spectrum models vs. experimental No bands Most bands match, ratios ? One band in UV Almost all bands match, ratios best Almost all bands match, ratios better

  6. Explaining models match to H-spectrum • Billiard ball – no bands, no interaction of light with H-atom • Plum pudding – one band, interaction of light with H-atom but only one transition • Bohr – most bands match, ratios of band heights not matching • DeBroglie – almost all bands match, ratios match better • Schrodinger - almost all bands match, ratios match best

  7. Quantum Mechanics video

  8. Explaining Bohr model of H atom

  9. Steps to create spectrum in Bohr model • Incoming photon excites electron to a higher shell • Photon must be high enough energy • Electron “chooses” to drop (relax, decay) to a lower shell • “When” and “which shell” completely unknown • When relaxes, excess electron energy is released as a photon of light • Energy of photon corresponds to difference in energy levels

  10. Bohr model of atom http://www.bigs.de/en/shop/anim/termsch01.swf

  11. Explaining power of quantum model

  12. Explaining powerFireworks!!!

  13. Explaining powerLuminescent paper

  14. Properties of a good explaining theory… • A good explaining theory • Is simple • Explains all the data • Doesn’t contradict itself • Connects previously unconnected data • Is fruitful • Leads to new experiments • Links to other theories

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