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Carbon , silicon and germanium have four...

Carbon , silicon and germanium have four valence electrons each . At room temperature which one of the following statements is most appropriate ?

A

The number of free electrons for conduction is significant only in Si and Ge but small in C.

B

The number of free conduction electrons is significant in C but small in Si and Ge.

C

The number of free conduction electrons is negligibly small in all the three.

D

The number of free electrons for conduction is significant in all the three.

Text Solution

Verified by Experts

The correct Answer is:
A
The four valence electrons of C, Si and Ge lie respectively in the second, third and fourth orbit. Hence energy required to take out an electron from these atoms (i.e. ionisation energy `E_(g))` will be least for Ge, followed by Si and highest for C. Hence, the number of free electrons for conduction in Ge and Si are significant but negligibly small for C.
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