Br2

Br2, also known as bromine, is a chemical element with the symbol Br and atomic number 35. It is a halogen, a nonmetal, and a member of Group 17 of the periodic table. Bromine is the third-lightest halogen and is a fuming red-brown liquid at room temperature, which evaporates readily to form a similarly colored vapor. Its properties are thus intermediate between those of chlorine and iodine.

Bromine is found in various minerals, particularly in the form of bromides, and is also present in seawater and brine pools. It is produced industrially from brine through a process involving chlorine. Bromine is used in various applications, including as a flame retardant, a disinfectant, and a component in certain pharmaceuticals and dyes. It is also used in organic chemistry as a reagent in various reactions.

Bromine has two stable isotopes, Br-79 and Br-81, with Br-81 being the more abundant. It has a number of radioactive isotopes as well, with the most stable being Br-77 and Br-83. Bromine compounds are known to be toxic, and exposure to bromine gas can cause irritation to the skin, eyes, and respiratory tract. Proper handling and safety measures are essential when working with bromine and its compounds.