Metals
Metals are the elements found within the d-group on the periodic table. The criterion for defining a metal lies in its ability to conduct and its dependence on temperature. If a material is a metallic conductor, the electric conductivity decreases as the temperature increases. Usually the valence band is not completely filled. Other properties of metals are that they have a lustre and are very malleable A diagram of the band structure can be seen below. An example of this is copper.
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