Question

The following pictures show population of bands for materials having different electrical properties classify them as insulator semiconductor or a mental

Answer 1

Answer:

The outer most band in an atom is the valence band. But when atoms form a solid, electrons may be elevated into a higher energy level called the conduction band. The determining factor as to whether a material is a conductor, semiconductor or insulator is if there are electrons present in the conduction band.

Answer 2

• the picture in the left represents a metal,
• the picture in the middle represents an insulator,
• the picture in the right represents a semiconductor.