The chemical symbol for chlorine is Cl. Chlorine is a highly reactive, greenish-yellow gas at room temperature and belongs to the halogen group on the periodic table. It has an atomic number of 17 and is widely used in various applications, including water purification, disinfection, and the production of chlorine-containing compounds. Chlorine is essential in agriculture for the production of fertilizers and pesticides, and in households, it is often found in bleach and cleaning products. Despite its beneficial uses, chlorine compounds can be hazardous; hence, safe handling and use are critical for safety.