I can't see why metals have overlapping bands and a higher Fermi level compared to Non-metals where there is no overlap and the Fermi level is not in the conduction band.

  • $\begingroup$ Probably just because they do and the valance theory works, not because they make sense or are derived some canonical theory. $\endgroup$ – marshal craft Aug 3 '18 at 11:15
  • $\begingroup$ Possible duplicate of Formation of the overlap in metal electron bands $\endgroup$ – sammy gerbil Aug 3 '18 at 12:24
  • $\begingroup$ I don't think it's answering the question I asked. $\endgroup$ – RJAAA Aug 3 '18 at 13:11
  • $\begingroup$ Metals have an unfilled band, not overlapping conduction/valence bands. So, why should all bands be just filled or empty? $\endgroup$ – Jon Custer Aug 3 '18 at 14:58
  • $\begingroup$ Don't non-metals also have unfilled bands? $\endgroup$ – RJAAA Aug 5 '18 at 23:05

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