Eng 45 - Chapter 1 - Structure(25)

Eng 45 - Chapter 1 - Structure(25) - Materials Scien ce...

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Materials Science Fall, 2007 Page 24 The different kinds of bonding occur simultaneously in most molecules and solids. However, one type usually predominates, and it is, therefore, convenient to classify materials as covalent, metallic, ionic or polar according to the dominant bonding mechanism. This classification is usually sufficient to characterize those properties that derive from the bond type. But it must not be applied too rigorously; each type of interaction makes some contribution to bonding in almost every case. 2.4 THE BAND MODEL As we discussed in Section 2.1, the bond model is useful largely because bonds are easy to visualize. Electrons are localized on atoms or in simple bonds between neighboring atoms, and occupy electron states that are taken to be atomic orbitals or simple combinations of them. These simplifications are, however, achieved at some cost. The bond model is not a convenient one to describe those properties of solids that are strongly influenced by the fact that electrons are relatively free to move, such as electrical
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This note was uploaded on 01/26/2010 for the course ENGLISH 45 taught by Professor Morris during the Spring '10 term at University of California, Berkeley.

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Eng 45 - Chapter 1 - Structure(25) - Materials Scien ce...

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