Considering the band structure of Si or Ge crystal of N atoms, at Zero Kelvin, it has CB and VB formed by

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4 N filled energy states, 4 N empty energy states

3 N empty energy states, 5 N filled energy states

4 N empty energy states, 4 N filled energy states

2 N empty energy states, 6 N filled energy states

answer is A.

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Detailed Solution

At 0K the conduction band is empty so the 4 valence electrons are present only in valence band.

Thus the CB and VB are formed by 4 N empty energy states, 4 N filled energy states.

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