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

C,Si and Ge have the same lattice structure. Why is C insulator while Si and Ge intrinsic semiconductor.

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

Sn, Si and Ge have the same lattice structure . Why Sn is a conductor while Si and Ge are Semiconductor?

Why are Ge and Si semiconductors ?

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 .

Why do Ge and Si are semiconductor?

Sn, C, and Si, Ge are all group XIV elements. Yet, Sn is a conductor, C is an insulator while Si and Ge are semiconductors. Why?

Sn, C, and Si, Ge are all group XIV elements. Yet, Sn is a conductor, C is an insulator while Si and Ge are semiconductors why?