In insulators (C.B. is conduction band and V.B. is valence band).

V.B. is partially filled with electrons

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C.B. is partially filled with electrons

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C.B. is empty and V.B. is filled with electrons

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C.B. is filled with electrons and V.B. is empty

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Solution

The correct option is C C.B. is empty and V.B. is filled with electrons
$C . B$ is empty and $V . B$ is failed.
Reason:- In conductors, the outer shell is filled completely (eg. $A r, N e$ , etc) hence the valence band will be filled and conduction band will be empty.

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