English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 105 F3Sm samarium trifluoride F3Tb terbium trifluoride F3Th thorium trifluoride F3Ti titanium trifluoride F3Tl thallium trifluoride F3Tm thulium trifluoride F3W tungsten trifluoride F3Y yttrium trifluoride