In a conductor (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other

In a conductor (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other
by

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the valence band and the conduction band overlap each other
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