Brom is a chemical element with the symbol Br and atomic number 35. It is a reddish-brown liquid at room temperature and belongs to the group of halogens in the periodic table. Bromine is known for its strong odor and is commonly used in various applications, including flame retardants, agricultural chemicals, and certain types of pharmaceuticals. Bromine is found naturally in seawater and in mineral deposits, often in the form of bromide salts. It was first discovered in 1826 by the French chemist Antoine Jérôme Balard. Due to its reactivity, bromine is typically handled with caution, as it can be harmful to human health and the environment.