`C` and `Si` both have same lattice structure, having `4` bonding electrons in each. However, `C` is insulator whereas `Si` is intrinsic semiconductor. This is because

Options

A. In case of C the valence band is not completely filled at absolute zero temperature.
B. In case of C the conduction band is partly filled even at absolute zero temperature.
C. The four bonding electrons in the case of C lie in the second orbit, whereas in the case of Si they lie in the third.
D. The four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit.

Answer

C

Explanation

The electronic configuration of carbon `(""_(6)C)` is `1s^(2)2s^(2)2p^(2)`. The electronic configuration of silicon `(""^(14)Si)` is `1s^(2)2s^(2)2p^(6)3s^(2)3p^(2)`.
Hence, the four bonding electrons of C and Si respectively lie in second and third orbit.