Energy band picture of an insulator

1. A.
   valence band is empty and conduction band is filled with electrons.
2. B.
   conduction band is empty and valence band is completely filled with electrons.
3. C.
   valence band is partially filled.
4. D.
   conduction band is partially filled with electrons.

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1. A.
   Very low and partially filled.
2. B.
   Very high and completely filled.
3. C.
   Very high and empty.
4. D.
   Very low and empty.

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1. A.
   very high, empty
2. B.
   very low, empty
3. C.
   very high, completely filed
4. D.
   very low, partially filled

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