An insulator is a poor conductor of energy. For example; Rubber is a poor conductor of electricity Rock is a poor conductor of heat A sponge is a poor conductor of sound.
There is more than one kind of insulation, the main types being thermal and electrical. Fiber glass is commonly used for thermal insulation, and rubber is a good electrical insulator.
types is a vague question there are highly reactive atoms and the opposite. also many different types of elements which range from alkalies and earth alkalies to the transition metals to the...