Discussion
In the energy band diagram of solids, if the conduction band and the valance band overlap, the solid is
Answer: B
Such a solid is a metal.
When the conduction band and the valence band overlap, there is no energy gap: electrons can move into empty states with no extra energy, so the material conducts freely. That is the band picture of a metal.
Semiconductors, whether elemental, inorganic or organic, have a small gap (about 1 eV for silicon) that electrons must be given energy to cross. Insulators have a large gap (several eV). Neither has overlapping bands.
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