C and Si both have same lattice structure ; having 4 bonding elec… - Vidyadip

MCQ

$C$ and $Si$ both have same lattice structure ; having $4$ bonding electrons in each. Howeve, $C$ is insulator where as $Si$ is intrinsic semiconductor. This is because

A
In case of $C$ the valance 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.
✓
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

Correct option: 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.

c
Electronic configuration of carbon $\left(^{6} \mathrm{C}\right)$ is $1 s^{2} 2 s^{2} 2 p^{2} .$

The electronic configuration of silicon $\left(_{14} \mathrm{Si}\right)$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}$

Hence, the four bonding electrons of $\mathrm{C}$ and $\mathrm{Si}$ respectively lie in second and third orbit.

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