Question

If conduction band is filled then why electron will not take part in conduction

Answer 1

Answer:

Only in the conduction band can electrons move easily and conduct electricity. In insulators there are practically no electrons in the conduction band. The amount of energy electrons can gain from thermal agitation is not enough to lift them from the valence band into the conduction band. The energy gap is too large.......................

Answer 2

Answer: In conduction band all the electrons can take part in conduction.

Explanation: Because there are no empty state below the fermi energy. So only the electron which are near to fermi energy level can take part in conduction.