* Electrons in Metals: Metals are good conductors because they have free electrons that can easily move throughout the material. These free electrons allow for the flow of electricity.

* Electrons in Plastics: Plastics, on the other hand, have tightly bound electrons that are not easily freed. This means that electricity cannot flow easily through them.

Here are some examples of how plastic's insulating properties are utilized:

* Electrical wiring: Plastic insulation covers wires to prevent electric shock.

* Circuit boards: Plastic is used to insulate electronic components on circuit boards.

* Electrical appliances: Many appliances use plastic casings to protect users from electric shock.

Important Note: While plastic is generally a good insulator, some plastics can become conductive under specific conditions, such as high temperatures or exposure to certain chemicals.