English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 068 Co(OH)2 cobalt(II) hydroxide Co(OH)3 cobalt(III) hydroxide CoS cobalt(II) sulfide CoS2 cobalt disulfide CoSb cobalt antimonide CoSe cobalt(II) selenide CoSeO3 cobalt(II) selenite CoTe cobalt(II) telluride