Hi I need help I need a catch phrase for my element carbon

Fill in the blank chromium(iii) sulfate is a transition metal compound containing the metal chromium and the polyatomic ion sulfate.the oxidation state of chromium in this compound is , and the chemical formula of the compound is _ _ ( _ _ ) ._ chemical name chemical formula chemical name chemical formula acetate c2h3o2– nitrite no2– carbonate co32– ammonium nh4+ hypocarbonite co2− cyanide cn– hydrogen carbonate (bicarbonate) hco3– hydroxide oh– chlorite clo2– peroxide o22– hypochlorite clo– phosphate po43– chlorate clo3– hydrogen phosphate hpo42– perchlorate clo4– dihydrogen phosphate h2po4– hydronium h3o+ sulfate so42– permanganate mno4– hydrogen sulfate (bisulfate) hso4– nitrate no3– sulfite so32–