Metals are good conductors, while nonmetals are poor conductors of Electricity.

Ans.

1. The electrons in the outermost orbit of the atoms of metals are free to move throughout the metal.
2. In the absence of potential difference, these electrons move in different direction and with different speed. There is no net flow of electrons in any direction.
3. When a potential difference is applied between the ends of metal wire, the net movement of the electrons from one end of the wire to the other end constitutes electric current.
4. But, nonmetals do not possess such free electrons. Hence, metals are good conductors, while nonmetals are poor conductors of electricity.