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  • Publicado : 13 de abril de 2010
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The liaison in the metals

Molecular orbital theory developed in a previous chapter, can be used to explain the properties of solids (ion, metallic and molecular). A solid may be formed by a seriesof atoms joined together by covalent type links. This idea has the advantage, chemical, treat the solid as a not very different from the small covalent molecules kind perspective. The approach isacceptable to describe the link in metallic solids as well as to explain properties that have these compounds such as brightness, the malleability and thermal and electrical conductivities. All theseproperties are the result of the contribution of each atom in the formation of a “sea of electrons” electron. Brightness and electrical properties derived from possessing such electron mobility. Highthermal conductivity observed in a metal is also a consequence of electronic mobility because an electron can collide with an atom that is vibrating and in the collision Atom transferred its energy tothe electron, which can, in turn, transfer it to another atom any part of the solid. The ease with which metals can be deformed is another consequence of the electron mobility since this "sea ofelectrons" can be adjusted easily and quickly to the deformations of the solid without modifying the link between atoms.

Electronic conduction is feature of the metallic solids and semiconductors. Theconsequent electrical conductivity temperature dependence approach is used to distinguish between a metal and a semiconductor.

• A metallic conductor is that substance whose electricalconductivity decreases with increasing temperature.

• A semiconductor is that substance whose electrical conductivity increases to temperature.

A solid insulating is a substance that has a lowelectrical conductivity; however when its conductivity can be measured, it increases with temperature, as in semiconductors. Two basic electrical behaviors, cash and semiconductor can be considered for all...
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