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Unformatted text preview: The exam on Wednesday October 28 will cover the following material: Chapter 5, Chapter 6 and Chapter 7.1 7.3 (the first three sections of Chapter 7) (Section 7.4 will not be included on this exam) Chapter 7 continued Lecture 14 October 20 2009 Bohr Model of the Hydrogen Atom 1. Hydrogen atom has only certain allowable energy levels (stationary states) 2. Atom does not radiate energy while in one of its stationary states. 3. Atom changes to another stationary state (e moves to another orbit) only by absorbing or emitting a photon whose energy is equal to the difference in energy between the two states. Limitations to Bohrs Model 1. Can only explain multielectron systems in a crude way (it is a one electron model) 2. There is a problem with describing an electron as simply a small particle that circles the nucleus Important results of Bohrs Model 1.Bohr Radius (a o ): mean radius of orbit of an electron around the nucleus of an Hatom at its ground state (n = 1) 1.Electrons exist only in discrete energy levels described by quantum numbers....
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 Fall '08
 MCINTOSH
 Chemistry

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