The ion S2O3^2-, known as thiosulfate, consists of two sulfur atoms and three oxygen atoms. It carries a negative charge of two, making it a polyatomic ion. Thiosulfate is commonly found in various chemical reactions and is often used in photography and as a reducing agent in chemical processes. Thiosulfate plays a significant role in environmental chemistry, particularly in the detoxification of cyanide in mining operations. It can also be used in analytical chemistry to determine the concentration of iodine in solutions. Its unique properties make it valuable in both industrial and laboratory settings.