English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 016 As2Se5 arsenic pentaselenide As3O4 arsenic tetraoxide As3P arsenic(III) phosphide As4O3 tetraarsenic trioxide As4O5 tetraarsenic pentaoxide As4S3 tetraarsenic trisulfide As4S4 tetraarsenic tetrasulfide AuBO gold monoboride monoxide