e4510lecture-3 - Bonding Solids are made of atoms or...

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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring , 2010 Bonding Solids are made of atoms or molecules These stick together – “ bonding Understanding bonding is fundamental – Microstructure – Properties Some important properties are determined by the nature of bonding alone
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring , 2010 Bonding Bonding is primarily by valence electrons Bonding is electrostatic The “chemist’s” model Chemical bonds are localized between atoms The “physicist’s” model – Electrons wander through the solid – Electron states are gathered into “bands”
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring , 2010 The Chemist’s model: Chemical Bonding Types of bonding Covalent => shared electron, saturated Metallic => shared electron, unsaturated Ionic => electrons exchanged to charge ions Dipole (Van der Waals ) => transient or permanent dipoles - + Ionic bond + - + - Dipole bond Shared Electron Bond covalent metallic
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring , 2010 Bonding Bonding is primarily by valence electrons Bonding is electrostatic The “chemist’s” model – Chemical bonds are localized between atoms The “physicist’s” model Electrons wander through the solid Electron states are gathered into “bands”
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J.W. Morris, Jr.
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