Bromine
Bromine or bromine is a chemical element belonging to halogen, and its elemental symbol is Br and its atomic number is 35. It is called cancellation because the smell is bad. A reddish brown volatile liquid at room temperature, the reactivity is intermediate between chlorine and iodine. Liquid bromine is very corrosive, causing damage to body tissues. Vapor is very harmful to the eyes and throat. It is not found in its pure form in nature, but is present mainly in the form of an aqueous, brominated salt. The relatively rare elements in the crust, but most of the bromine compounds are dissolved in water, so they are abundant in seawater, and most of them are produced in salt water. The main producing countries are the United States, Israel, and China, and the total production is similar to magnesium, which is much richer in the crust. Organic bromine compounds easily release bromine atoms at high temperatures, which has the effect of preventing the chemical chain reaction of the radicals. By using these characteristics, it can be used for flame retarding.