English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 178 RbBr rubidium bromide RbC2H3O2 rubidium acetate RbCl rubidium chloride Rb2SeO3 rubidium selenite Rb2SeO4 rubidium selenate Rb3C6H5O7·H2O rubidium citrate - monohydrate SCN− thiocyanate SF4 sulfur tetrafluoride