Chlorine ppm calculator. Chlorine (chemical symbol Cl, atomic number 17) is a nonmetal that belongs to a group of chemical elements known as halogens. Learn about the symptoms and treatment options today. Chlorine is a yellow-green gas at room temperature. Chlorine (pronounced as KLOHR-een) is a highly reactive diatomic gas belonging to the family of halogens. Chlorine can explode with many common substances. Chlorine is a chemical element; it has symbol Cl and atomic number 17. . Chlorine is used in the production of many common household and industrial products, including water treatment, disinfectants, and plastics. As a member of the halogen group, it is highly reactive, especially with hydrogen, forming hydrochloric acid, a substance fundamental to various industries. Chlorine is a toxic, corrosive, greenish yellow gas that is irritating to the eyes and to the respiratory system.
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