Which term describes metals that are generally good conductors of heat and electricity?

The term that describes metals which are generally good conductors of heat and electricity is metals. This refers to the intrinsic properties of metals, which include a high density of free electrons that can move easily within the metal structure. This free electron movement is what allows metals to conduct heat and electricity efficiently.

In contrast to metals, insulators are materials that resist the passage of electrical current and heat due to their lack of free electrons. Alloys consist of two or more elements, typically including at least one metal, and can have varying conductive properties depending on their composition and structure. Composites are materials made from two or more different substances, exhibiting unique properties that are not necessarily indicative of good electrical or thermal conductivity. Therefore, metals stand out as the best descriptors for materials that are effective conductors of both heat and electricity.