Chloride ions are negatively charged particles formed when chlorine atoms gain an electron. They are represented by the chemical symbol Cl-. Chloride ions play a crucial role in maintaining the balance of fluids in the body and are essential for various biological functions, including nerve transmission and muscle contraction. In nature, chloride ions are commonly found in salt, particularly in sodium chloride or table salt. They are also present in seawater and are important for the health of aquatic ecosystems. Additionally, chloride ions are used in various industrial processes, including the production of chlorine gas and other chemicals.