Q: Free-flowing electrons enable what materials to conduct electricity and heat very well?


Read this paragraph and choose the correct option from the provided answers:

This model for metallic bonding explains some of the physical properties of metals. Metals conduct electricity and heat very well because of their free-flowing electrons. As electrons enter one end of a piece of metal, an equal number of electrons flow outward from the other end, allowing an electrical current to pass through the material with minimal resistance. Additionally, because the electron "glue" that holds the metal atoms together is very easy to deform and reshape, bulk metals can be easily hammered, bent, and pulled without breaking apart.

 Choices:

- noble gases

- alloys

- acids

- metals


A:
metals