Here's why:
* Diatomic molecule: Chlorine exists as a diatomic molecule (Cl2), which means it has a relatively weak van der Waals force of attraction between molecules.
* Nonpolar: Chlorine is a nonpolar molecule, further weakening the intermolecular forces.
* Small size: The chlorine atoms are relatively small, leading to a smaller surface area for interaction.
These factors contribute to the low boiling point of chlorine, which means it readily transitions from a liquid to a gas at relatively low temperatures.