Halogens physical properties.

• Fluorine - F2.

  Very pale yellow gas. It is highly reactive
• Chlorine. Cl2

  Greenish, reactive gas, poisonous in high concentrations
• Bromine - Br2

  Red liquid, that gives off dense brown/orange poisonous fumes.
• Iodine - I2

  Shiny grey solid sublimes to purple gas