In good conductors of electricity,the type of bonding that exists is

Explain conductor (metal),insulator,and semiconductor by drawing diagrams based on energy bands.

Explain the classification of materials on the basis of resistivity.

Give a brief explanation of solid state semiconductor electronics.

In a semiconductor,which of the following statements are correct?
$(i)$ There are no free electrons at $0\, K$.
$(ii)$ There are no free electrons at any temperature.
$(iii)$ The number of free electrons increases with temperature.
$(iv)$ The number of free electrons is less than that in a conductor.

In a semiconductor,