Carbon,silicon and germanium have four valenc | vedclass

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Question

(A) Carbon $(C)$,Silicon $(Si)$,and Germanium $(Ge)$ all belong to group $14$ of the periodic table and have $4$ valence electrons.At room temperature

Vedclass · Accepted Answer

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

Vedclass · Answer

(A) Carbon $(C)$,Silicon $(Si)$,and Germanium $(Ge)$ all belong to group $14$ of the periodic table and have $4$ valence electrons.At room temperature,the energy band gap $(E_g)$ for Carbon (diamond) is approximately $5.4 \ eV$,which is very large,making it an insulator.The energy band gap for Silicon is approximately $1.1 \ eV$ and for Germanium is approximately $0.7 \ eV$.Because these band gaps are relatively small,thermal energy at room temperature is sufficient to excite a significant number of electrons from the valence band to the conduction band in $Si$ and $Ge$.Therefore,$Si$ and $Ge$ act as semiconductors,while $C$ acts as an insulator due to its large band gap.

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

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