English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 199 WO2Br2 tungsten(VI) dioxydibromide WO2Cl2 tungsten(VI) dioxydichloride WO2I2 tungsten(VI) dioxydiiodide WO3 tungsten(VI) oxide WO42− tungstate ion WS2 tungsten(IV) sulfide WS3 tungsten(VI) sulfide WSe2 tungsten(IV) selenide