A greenish yellow, heavy, highly poisonous gaseous element (Cl; at. no. 17; at. wt. 35.4527), used commercially for bleaching and for disinfecting water supplies.

【化】氯(元素符号 Cl；原子序 17；原子量 35.4527)；氯气(漂白及消毒用)；分子式为Cl₂。