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UNC-Chapel Hill CHEM 251 - Part II Metals

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CHEM 251 1st Edition Lecture 12 Outline of Last Lecture I. Clicker QuestionII. MetalsIII. Band TheoryIV. PropertiesV. Band GapOutline of Current Lecture VI. Clicker QuestionVII. Metal Structure VIII. AlloysIX. Energy-The GridCurrent LectureX. Clicker Questiona. Coordination Number: 12 b. Point Group: D3dXI. Metal Structurea. lattice: an infinite regular arrangement of atomsb. unit cell: smallest repeating structure of latticeThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.c. 1) Simple Cubici.ii. coordination number: 6iii. occupancy: 52%d. 2) Body Centeredi.ii. Coordination number: 8iii. Occupancy: 68%e. 3) Hexagonal Close Packedi. coordination number: 12ii. occupancy: 74%f. 4) Face centered cubic / cubic close packingi.ii. coordination number: 12iii. occupancy: 74%g. Changing Phasesi.XII. Alloysa. Solid solution: freely diffusing mixture of 2 elementsb. Compound: particular stoichiometryXIII. Miniaturizing Metalsa. From bulk to nanoparticlesb. Lower melting pointc. Colorful quantum dotsi. Emit light of different color depending on sizeXIV.Energy-The Grida. Transmissioni. Traditional: aluminum w/ steel coreii. Modern: aluminum w/ carbon fiber coreiii. Losses- only


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UNC-Chapel Hill CHEM 251 - Part II Metals

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