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C, Si and Ge have same lattice structure...

C, Si and Ge have same lattice structure. Why is C insulator,
while Si and Ge intrinsic semiconductors ?

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Verified by Experts

Energy required to take out outer orbit electrons is less for Ge and Si but very large for C. So conduction electron is not easily available for C and hence it is insulator.
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Assertion (A) : C,Si and Ge have 4 Valancy each both but C is an insulator where as Si and Ge are semi conductors Reason ( R) : Energy gap is least for Ge , less for Si compared to C , So that free electrons for conduction in Ge and Si are significant but negligible small for C .

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