# Electronic Devices - Semiconductors - Discussion

Discussion Forum : Semiconductors - General Questions (Q.No. 11)
11.
Which statement best describes an insulator?
A material with many free electrons.
A material doped to have some free electrons.
A material with few free electrons.
No description fits.
Explanation:
No answer description is available. Let's discuss.
Discussion:
19 comments Page 2 of 2.

Deepti dhuriya said:   9 years ago
Yes insulator have no free electron. Then how option C is right? It must be D.

Generally the conductivity is completely depends on the concentration of the free electrons so insulator has no free electrons. And also the carbon material that is diamond is a insulator because of it has a strongly bonded with neighbourhood four electrons so it has no free electrons in diamond. So this is the one of the example for the insulator.

Insulators does not allow flow of electricity. It has no free electrons. I think a described c answer is wrong.

If the number valance electron in an atom for conductor 1/2/3/that material is called as conductor since semiconductor 4 insulator 5/6/7/ thjat material is called as insulator.

But practically it is not possible @basha, if it is possible describe how?

I will support naveen statement.
Every insulator is a conductor. For example, for Conductors Energy gap Eg <0.5 , for semiconductors Eg=1.00 for Insulators Eg is too large .If you give the potential value > Eg value for insulator then it acts as conductor.

So option C is correct.

There are very few free electrons in an insulator, because valence electrons are tightly bound to the atoms.

Ex: wood, glass, and diamond.