English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 115 FeF2 · 4H2O iron(II) fluoride tetrahydrate FeI iron monoiodide FeI2 iron diiodide or iron(II) iodide FeI2 · 4H2O iron(II) iodide tetrahydrate FeI3 iron(III) iodide FeMoO4 iron(II) orthomolybdate FeO iron monoxide or iron(II) oxide FeO2 iron dioxide