Eng 45 - Chapter 1 - Structure(29)

Eng 45 - Chapter 1 - Structure(29) - Materials Scien ce...

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Materials Science Fall, 2007 Page 28 it is necessary to describe their character or behavior we simply invoke the characteristics of the corresponding states of the free atom. The valence and excited electron states overlap greatly and produce broad bands of states in which electrons move easily through the whole solid (small m*). The valence electrons control bonding and conduction in the solid. They move easily through the solid, and behave very much like free electrons in unbound states. The development of bands as the electron states come to overlap one another is il- lustrated in Fig. 2.9, which shows the results of quantum mechanical calculations of the electron energies in sodium and carbon as a function of interatomic separation in the con- figuration each adopts in the solid state. In both cases the valence orbitals spread signifi- cantly and overlap one another in energy, while the core orbitals (illustrated by the 2p or- bital of Na) remain narrow even at the equilibrium separation, r
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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(29) - Materials Scien ce...

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