Physical properties of halogens

• Fluorine is a very pale yellow gas and is the lightest halogen, existing as a highly toxic gas.
• Chlorine is a pale green gas with a choking, unpleasant smell and is very poisonous if inhaled even in small quantities.
• Bromine is a heavy, reddish brown, volatile liquid with a choking, irritating smell.
• Iodine is a purple-black shiny solid with an irritating smell.
• Iodine sublimes rapidly when heated.