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The Metallic Elements
About Seventy-nine of the one hundred substances are metals. A metal may be defined as a substance which has large conductivity of electricity and of heat, has a characteris ¬ tic luster, called metallic Luster, and some other properties. In addition, the electric conductivity increases with decrease in temperature.
The metals themselves and their alloys are of great useful ¬ ness to man. The importance of some alloys is due primarily to their hardness and strength. These properties are a conse ¬ quence of the presence in the metals of very strong bonds be ¬ tween the atoms.
For this reason it is of great interest to us to understand the nature of the forces holding the metal atoms together in these metals and alloys.
First we should consider an alloy, it is a metallic material containing two or more elements. It may be homogeneous, consisting

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