SDN:P07::CF12S45
tendency_of_atmosphere_moles_of_halon1211
accepted
The phrase "tendency_of_X" means derivative of X with respect to time. The construction "atmosphere_moles_of_X" means the total number of moles of X in the entire atmosphere, i.e. summed over the atmospheric column and over the entire globe. The chemical formula for Halon1211 is CBrClF2. The IUPAC name for Halon1211 is bromo-chloro-difluoromethane.