chapter 14

How does the Bohr atomaccount for the discretespectrum of an atom?Think about walking up steps, or up aramp.What energies can you have on steps?What energies can you have on aramp?Models of Matter so far:ModelContinuousMolecularPlumPuddingNuclear /solar systemBohrExplainsappearancesBrownian motioncharged partsRutherford’sexperimentdiscrete spectraDoes NOT explainBrownian motioncharged partsRutherford’sexperimentdiscrete spectrasee next slide3132Problems with the “BohrModel”1. Why are only certain orbits possible (not like asolar system!)2. Why doesn’t the undisturbed atom radiate? (Whydon’t the electrons fall into the nucleus?)‘Because Bohr says so’is not a good answer3. Works really well for atoms with 1electron, not well at all for otheratoms.33