Question

which of the following are usually good conductors of heat and electricity?
metals
non - metals
metalloids
none of the above.

Explanation:

Metals have free electrons that can move easily, allowing them to conduct heat and electricity well. Non - metals generally lack these free electrons for good conduction. Metalloids have properties in between metals and non - metals and are not as good as metals in conducting heat and electricity.

Answer:

Metals