Chlorine is a non-metallic element, not a compound. It belongs to the halogen group in the periodic table and exists as diatomic molecules (Cl₂) at room temperature. Non-metallic elements generally have low electrical and thermal conductivity, are poor conductors of heat, and tend to form covalent bonds. Chlorine, as a non-metal, exhibits these properties and participates in chemical reactions by gaining electrons to achieve a stable electronic configuration.