Chlorine does not exist as a single atom at room temperature. Instead, it exists as a diatomic molecule, Cl₂.

Here's why:

* Electronegativity: Chlorine is a highly electronegative element, meaning it strongly attracts electrons.

* Bonding: To achieve a stable electron configuration, two chlorine atoms share a pair of electrons, forming a covalent bond. This bond is strong enough to hold the two chlorine atoms together as a molecule.

Properties of Chlorine Gas:

* Color: Yellowish-green

* Odor: Pungent, suffocating

* State: Gas

* Density: Heavier than air

* Reactivity: Highly reactive, particularly with metals and organic compounds

Important Note: Chlorine gas is toxic and can be dangerous if inhaled. It is important to handle chlorine gas with caution and follow safety precautions.