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In metals such as Mg, energy bands overlap and both 3s and 3p bands contain electrons. Overlap of bands is responsible for the metallic properties of Mg. If the 3s and 3p bands did not overlap, then the 3s band would be full, the 3p band empty and Mg would not be metallic. This is the situation that holds in insulators and semiconductors. From A.R. West, Solid State Chemistry and Its Applications, WILEY,2014 |
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