Question

what are valence band and conduction band? ​

Answer 1

Answer:

In non-metals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states.

Answer 2

Answer:

valence band is the place where electrons reside

when current is about to flow the get excited from valence band to conduction band