Why is metal the best conductor of heat?

Answer 1

Because its electron conduction band is filled with a freely moving "electron gas" that heats up and can move throughout the metal (same as an electric current is a "wind" in this "electron gas"). In other materials the electrons are localized.

Answer 2

Metal is a good conductor of heat because the atoms within the metal are close together. This will help because the heat can be transferred from one to another quicker then if the molecules were spread out.

Answer 3

Metal is a good conductor of heat because its atomic structure allows heat energy to be easily transferred through the material. Metals have loosely bound electrons that can move freely, transferring thermal energy. This rapid movement of electrons allows metals to quickly conduct heat through the material.