English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 200 WTe2 tungsten(IV) telluride W2C tungsten carbide YAs ytrrium arsenide YB6 yttrium boride YBr3 yttrium bromide YC2 yttrium carbide YCl3 ytrrium chloride YF3 yttrium fluoride