Question

Which of the following statements are correct regarding band theory of metallic bond ?

• A. Valence band is empty or half filled in metal
• B. Conduction band is empty in metal
• C. Energy gap between conduction and valence band is very less in non-conductors
• D. Overlapping of conduction & valence band occurs in semiconductors

Answer 1

The correct option is B Conduction band is empty in metal

Highest-energy electrons of metallic crystals occupy either a partially filled band or a filled band that overlaps an empty band called conduction band. Energy gap between conduction and valence band is so less in metal that they overlap with each other. While the energy gap between conduction and valence band in semiconductors is more than metal and largest in non-conductors. So overlapping of conduction and valence band is not feasible in semiconductors and non-conductors.
Hence, the correct answer is option (b).