QJEEM07Phb39e: JEE Main 2007 Physics - Class 12 JEEM07Phb39e Solution: Carbon, silicon and germanium have four valence electrons each. …

Question

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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

Accepted Answer

S i

and

G e

are semiconductors but

C

is an insulator. Also, the conductivity of

S i

and

G e

is more than

C

because the valence electrons of

S i, G e

and

C

lie in third, fourth and second orbit respectively.

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