Carbon , silicon and germanium have four velence electrons each . At room temperature which one of the following statements is most appropriate ?
A
the number of free electron for conduction is significant is `Si and Ge` but small in `C`
B
the number of free conduction electron is significant in `C` but small in `Si and Ge`
C
the number of free conduction electron is negligibly small in all the three.
D
the number of free electron for conduction is significant in allthe three
Text Solution
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The correct Answer is:
A
`Si and Ge `are semiconductors but `C` is an insulator Also , the conduactively of `Si and Ge` is more then `C` because the velence electron of `Si,Ge and C ` lie in third fourth and second orbit respectively
