Question

The valence band of those material remains full of electrons. The conduction band of those material remains empty. The substance is

• A. an insulator
• B. a conductor
• C. a superconductor
• D. a semiconductor

Answer 1

The correct option is A an insulator

There are two types of bands in a material i.e, valence and conduction band. The conductivity depends on number of electrons in the conduction band. A material which has very low conductivity is due to empty conduction band and valence band full of electrons. Such a material is an insulator.