English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 064 Ce2S3 cerium(III) sulfide ClF chlorine fluoride ClF3 chlorine trifluoride ClF5 chlorine pentafluoride ClOClO3 chlorine perchlorate ClO2 chlorine dioxide ClO3F chlorine trioxide fluoride Cl2 chlorine