Chapter2-lecture-3

Chapter2-lecture-3 - Atomic Bonding Covalent, Metallic and...

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1 Atomic Bonding – Covalent, Metallic and Secondary Issues to address… What is covalent bonding? What is metallic bonding? What is secondary bonding? What material properties can be inferred from bonding?
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1s 2 2s 2 2p 6 3s 2 3p 5 1s 2 2s 2 2p 6 3s 2 3p 6 1s 2 2s 2 2p 6 3s 2 3p 5 1s 2 2s 2 2p 6 3s 2 3p 6 Electron sharing 17 Cl 17 Cl Covalent Bonding - Electron Sharing
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3 Illustration of Covalent Bonding in Chlorine Gas Figure 2-13, Shackelford Planetary model Actual electron density Electron dot schematic A bond-line schematic H 2
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Carbon Bonding – Directional Carbon electron configuration: 6 electrons: 1s 2 2s 2 2p 2 1s 2 2s 1 2p 3 SP3 hybridization Tetrahedral configuration of covalent bonds with carbon Typically small coordination numbers (In Table 2.1 CN=12 if r/R=1)
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Covalent Bonding in Polymers Figure 2-14, Shackelford Figure 12.9, Shackelford 1s 2 2S 2 2p 2 1s 2 2s 2 2p 6 6 C
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6 Examples of Covalent Bonding H 2 H 2 O C(diamond) SiC GaAs Cl 2 F 2 • Molecules of nonmetallic elements: H 2 , Cl 2 , F 2 • Molecules of dissimilar elements: H 2 O, CH 4 , HF • Elemental solids: C(diamond), Si, Ge • Compound solids: SiC, GaAs • Along polymer chains Figure 2-2, Shackelford
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7 Example Calculate the reaction energy for the polymerization of polyvinyl chloride (C 2 H 3 Cl)
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12 Mg 1s 2 2s 2 2p 6 3s 2 Metallic Bonding – Electron Sharing, Non-directional, Electrons Delocalized
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This note was uploaded on 10/03/2011 for the course EMCH 371 taught by Professor Dai-hattrick during the Spring '11 term at South Carolina.

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Chapter2-lecture-3 - Atomic Bonding Covalent, Metallic and...

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