* Electrical Conductivity: Chlorine is a non-metal and exists as a diatomic molecule (Cl₂). Non-metals generally have a poor ability to conduct electricity. This is because they have tightly bound electrons that cannot easily move freely to carry an electrical current.

* Thermal Conductivity: Similar to electrical conductivity, chlorine's non-metallic nature makes it a poor conductor of heat. The molecules are held together by weak intermolecular forces, which limit the transfer of heat energy.

In contrast:

* Metals are excellent conductors of both electricity and heat due to their free-moving electrons.

* Some non-metals like carbon (in the form of graphite) can conduct electricity due to its unique structure.

Therefore, chlorine is not a good conductor of either electricity or heat.