What is a semi-conductor?

In terms of band gaps, what is the difference between a conductor and a semiconductor?

The temperature coefficient of condcutance for condcutors and semi conductors respectively are

How extrinsic semi conductors are classified?

A pure (or intrinsic) semi conductor is heated slowly. Its conductance will

Correct the following statements if required changing the underlined protion. In extrinsic semi conductors the conduction character depends on temperature.