The energy gap in band theory is almost equivalent to zero in conductors. It is roughly equivalent to I e V in semiconductors and about 5 e V in insulators.
In solid-state physics, the band theory is a theoretical model that describes the states of electrons in solid materials that can only have energy values that fall inside particular narrow ranges. The behavior of every other particle nearby affects how an electron behaves in a material and, consequently, how much energy it has.
The quantum state that an electron assumes inside a solid metal is described by the band theory of solids. There are numerous distinct energy levels present in every molecule. Band theory does a good job of explaining how electrons behave inside molecules. Science's quantum revolution provided part of the knowledge that went into the development of band theory.
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