The following pictures show the electron populations of the bands of MO energy levels for the four different materials:

a. Identify which part is the valence and conduction band in each material. b. Classify each material if they are insulator, semiconductor, or metal. c. Tell whether the conductivity of each material increases or decreases when the temperature increases.

3. (10 points) The following pictures show the electron populations of the bands of MO energy levels for four different materials: a. Identify which part is the valence and conduction band in each materials. b. Classify each material if they are insulator, semiconductor, or a metal. c. Tell whether the conductivity of each material increases or decreases when the temperature increases