freon-12, dichlorodifluoromethane, molecule model and chemical formula

freon freon 12 r-12 r12 dichlorodifluoromethane molecule model chemical formula chemical cfc hcfc refrigerant aerosol spray propellant halon chlorofluorocarbon halomethane genetron fluorocarbon arcton dichloride difluoride fluorine chlorine banned damaging effect environment ozone layer fire retardant e940 940 ccl2f2 gas colorless skeletal structural structure compound organic substance molecular science research chemistry composition isolated vector