Eng 45 - Chapter 1 - Structure(31)

Eng 45 - Chapter 1 - Structure(31) - Materials Scien ce...

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Materials Science Fall, 2007 Page 30 would be filled if the electrons were placed in the states of lowest possible energy. We shall discuss this point further when we consider the electrical properties of conductors.) In the band model there are two situations that lead to metallic conduction. They are illustrated schematically in Fig. 2.10, which is a drawing of the band structure like Fig. 2.8, but with the potential energy plot removed for simplicity. The first kind of metal has a valence band that is only partly filled. Since there are two electrons states per energy level, a band necessarily contains an even number of electron states. Elements that have odd valence are, hence, necessarily metallic unless the atoms are gathered into molecular groupings that have an even number of valence electrons. Group IA elements such as Li, Na and K, Group IB elements like Cu, Au and Ag, and Group IIIB elements like Al, Ga and In are all metals. However, the Group IIIB metal boron (B) is a
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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(31) - Materials Scien ce...

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