Eng 45 - Chapter 1 - Structure(15)

Eng 45 - Chapter 1 - Structure(15) - Materials Scien ce...

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Materials Science Fall, 2007 Page 14 [L. Pauling, The Nature of the Chemical Bond ], though it has been developed by many others. It focuses on the interaction between the valence electrons of the atoms that are immediate neighbors of one another, even when those atoms are immersed in an essentially infinite solid. The electrons are placed in atomic orbitals that overlap to form chemical bonds that are localized in space. The qualitative power of this model derives from the fact that the bonds are relatively easy to visualize, particularly when they are saturated in the sense that all the available bonding states are filled with electrons. The model is particularly useful for neutral molecules, in which the bonds are almost always saturated. It also provides a simple physical picture of bonding in most semiconducting and insulating solids. It is less useful for metals, which have inherently unsaturated bonds. And it is awkward to use when one is trying to understand properties such as
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Eng 45 - Chapter 1 - Structure(15) - Materials Scien ce...

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