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Conductors have a partially filled valence band and an overlapping conduction band, allowing electrons to move freely between the two bands. This unobstructed electron flow results in the material's ability to conduct electricity. Semiconductors have a small energy gap between the valence and conduction bands, allowing some electrons to jump from the valence band to the conduction band at room temperature. The conductivity of a semiconductor increases with temperature as more electrons gain the necessary energy to transition into the conduction band. Insulators have a significant energy gap between the valence and conduction bands, preventing electrons from moving up to the conduction band. 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