Which of the following statements are true about metals ?

Options

A. Valence band overlaps with conduction band
B. The gap between valence band and conduction band is negligible
C. The gap between valence band and conduction band cannot be determined
D. Valence band may remain partially filled.

Answer

A, B, D

Explanation

c,d are not true.
c is not tre because imurity defect changes the mass of the solid and as a result density changes.
d is not true because Frenkel defect does not bring about any change in mass or volume of the solid.