THE energy band structure of a solid determines whether it is a conductor , an insulator or a semiconductor .
A free electron or an electron of an isolated atom may have only certain discreate energies and can move in discrete energy level . energy level of isolated atoms are not affected by distant atoms . AS we bring together large number of identical atoms in order to form a solid , significant changes take place in the energy levels . Each atoms is in the electrostatics field of neighbouring atoms .
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