The free electron density is more in which of the following and why?

Asked by  | 21st Nov, 2012, 06:25: PM

Expert Answer:

The free electron density is more in conductors as compared to insulators and semiconductors. Since in insulators all the electrons are tightly bound to atoms by ionic or covalent bonds, so that almost no current flows i.e. no free electron density. While in case of semiconductors, it is a case in between 'conductor' and 'insulator'.
 
Conductors have more free electron density than electrolytes because the current through a conductor is due to free electrons that flow and complete the circuit whereas the current through an electrolytic cell is because of the flow of ions i.e. positive ions (cations) and negative ions (anions).
 

Answered by  | 23rd Nov, 2012, 12:14: PM

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