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What is Valence and conduction bands as used in electronics?

Answer Text:
Valence and conduction bands.
-Valence band is the highest range of electron energies where electrons are normally present at zero temperature. Conduction
band is the range of electronenergy higher than that of the valence band sufficient to make electrons free (delocalized); responsible
for transfer of electric charge. Insulators and semiconductors have a gap above valence band followed by conduction band above it. In
metals, the conduction band is the valence band.