StudentLecture_26 - This week in Chemistry 11500 M Lecture...

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1 This week in Chemistry 11500 M Lecture 26, 11/29/2010 Laboratory: Gold Nanoparticles Homework Final, Wednesday 12/15, 1:00 PM Hall of Music 2 hours, 35 – 40 multiple choice questions Pencil, PUID, non-programmable calculator, seat location
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2
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3 How does electrical conduction happen in solids? Electronic structure of solids Classes: conductor semiconductor insulator
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4 Band Theory Recall atomic energy levels and orbitals Recall: “valence orbitals” = outermost orbital with highest value
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5 Band Theory As the number of atoms in a solid increases, the number of available energy levels increases. The number of energy levels in a cluster of atoms = the total number available from the individual atoms For Li 2s orbitals; 1 valence electron From each Li atom.
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6 Band Theory Electrons will fill energy levels from the bottom up forming an unfilled band. As the number of atoms in the group increases, the energy levels get closer and closer together, until they eventually make a continuous “band.”
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Band Theory Since energy levels are so close, in some materials this will result in a filled band at the bottom (“ valence band ”), and an empty band at the top (“ conduction band ”). They will be separated
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This note was uploaded on 01/30/2011 for the course CHEM 116 taught by Professor Stevenson during the Spring '08 term at Purdue University-West Lafayette.

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StudentLecture_26 - This week in Chemistry 11500 M Lecture...

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