Copper is a good conductor because its atoms are tightly packed together and because of free mobile electrons.
Copper is a metallic substance found in nature.
Metals are good conductors of heat and electricity.
Metals are good conductors of heat because there atoms are tightly packed together.
Metals are also good conductors of electricity because they have electrons that are mobile.
Therefore, copper is a good conductor because its atoms are tightly packed together and because of free mobile electrons.
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