English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 106 F3Yb ytterbium trifluoride F3Zr zirconium trifluoride F4Ge germanium tetrafluoride F4Ge2 digermanium tetrafluoride F4Hf hafnium fluoride F4Mg2 dimagnesium tetrafluoride F4Mg2 magnesium fluoride F4Mo molybdenum tetrafluoride