Chlorine dioxide
![](/Images/godic/202502/05/Chlorine_dioxide_gas_and_solution2031.jpg")
![Comparison of three-electron bond to the conventional covalent bond](/Images/godic/202502/05/Graphical_comparison_of_bonds.svg2031.png")
Chlorine dioxide is a chemical compound with the formula ClO2. This yellowish-green gas crystallizes as bright orange crystals at −59 °C. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching.