Some Chemical Symbols - (n.)
O2: molecular oxygen
O3: ozone
N2: molecular nitrogen
N2O: nitrous oxide
NO: nitric oxide
NO3: nitrate radical
NOx: Sum of NO and NO2
NO3- : nitrate ion
HNO3: nitric acid
NH3: ammonia
NH4+ : ammonium ion
H2: molecular hydrogen
H2O: water
OH: hydroxyl
HO2: hydroperoxyl
HOx: the sum OH and HO2
C: carbon; there are 3 isotopes: 12C, 13C, 14C
CO: carbon monoxide
CO2: carbon dioxide
F2: molecular fluorine
Cl2: molecular chlorine
Br2: molecular bromine
CFC: chlorofluorocarbon
CFC-11: CFCl3 or trichlorofluoromethane
CFC-12: CF2Cl2 or dichlorodifluoromethane
CFC-113: C2F3Cl2 or trichlorotrifluoroethane
CFC-114: C2F4Cl2 or dichlorotetrafluoroethane
CFC-115: C2F5Cl or chloropentafluoroethane