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This 1 page Class Notes was uploaded by Carmela Kilback on Wednesday September 9, 2015. The Class Notes belongs to CHEM 165 at University of Washington taught by James Mayer in Fall. Since its upload, it has received 24 views. For similar materials see /class/192539/chem-165-university-of-washington in Chemistry at University of Washington.
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Date Created: 09/09/15
Solms Review Sheet Chemistry 165 MATERIAL Electronegativity x of atoms involved Bonding Band Structure Properties and Examples METALS Elements electronegativity x s 19 metallic AX compounds alloys x s 19 for both A and X Examples Li Zn Fe brass 60 Cu 40 Zn Properties good conductors of electricity reflective malleable melting point AHmom depend on strength of metallic bonding Fermi level gt partially filled band large empty area large filled area SEMICONDUCTORS Elements electronegativity x 19 21 covalent conduction band X compounds x 15 25 for both antibondincg with small difference between A and X small ban gap Examples Si Ge GaAs InP valence band bonding Properties poor to ok conductors of electricity colored INSULATORS a Covalent Elements electronegativity x gt 21 conduction band AX compounds x gt 21 for both covalent antibonding Examples diamond C S Properties very poor conductors of electricity typically white or light colored large band gap valence band bonding b Ionic AX compounds with gt 15 difference in x between A and X Elements none ionic Examples NaCl CaO K28 Properties very poor conductors of electricity typically white or light colored zz r lattice energy U 138 900M 1 DDDDDD cation band empty large band gap anIon band lull c Molecular solids no extended bonding through the solid Band structure not really appropriate stable molecules have discrete low lying filled orbitals and hi gh lying empty orbitals Elements 12 SS P4 Almost all of organic chemistry fits under this category Properties very poor conductors of electricity typically white or light colored
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