A). A material having large number of free electrons can conduct very easily.
Example: Copper has 8.5X10 power 28 free electrons per cubic meter which is very large number. Hence copper is called good conductor. In fact in the materials like copper ,aluminum there is no forbidden gap between valence band and conduction band. the two bands overlap. Hence even at room temperature , a large number of electrons are available for conduction .So without any additional energy , such metals contains a large number of free electrons and hence called good conductor.
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