Answer: In conductors, valence and conduction bands overlap.
- A In conductors, valence and conduction bands overlap
- B In semiconductors, the band gap is larger than in insulators
- C In insulators, there is no valence band
- D In n-type semiconductors, holes are the majority charge carriers
Correct answer: A. In conductors, valence and conduction bands overlap
Explanation: Conductors have overlapping valence and conduction bands, allowing free electron movement. Insulators have very large band gaps; semiconductors have small band gaps; n-type semiconductors use electrons as majority carriers.
The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.
Concept context
Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.