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In the band model there are 2 situations that lead to metal conduction. A band necessarily contains an even number of electron states. Elements that have odd valences like Na and Al are metallic unless the atoms are gathered into molecular groupings that have an even number of valence electrons. The 2nd kind of metal has an even number of valence electrons: The elements from groups II A and II B like Mg are metals because the band of excited states ( called conduction band) overlaps...
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