+**Band gap** is the energy range within a material where no [electron](/wiki/electron) states can exist. This crucial property dictates if a substance behaves as a [semiconductor](/wiki/semiconductor), insulator, or conductor.
+## See also
+- [Conduction Band](/wiki/conduction_band)
+- [Valence Band](/wiki/valence_band)
+- [Insulator](/wiki/insulator)
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