Question

Besides overlapping valence and conduction bands, which band condition allows a metal to conduct?

Options

• Electrons cannot exist in the forbidden energy gap

• Conduction band is completely empty

• Valence band is completely filled and conduction band is completely empty

• Conduction band is partially filled

Answer 1

A metal conducts if its valence and conduction bands overlap or its conduction band is partially filled. Both conditions make free electrons available.