Page ION NAMES AND FORMULAE Monatomic Polyatomic Ag silver ion BO ‐ borate ion Al aluminum ion C H O ‐ acetate ion Au and Au gold ion ClO ‐ hypochlorite ion Be beryllium ion ClO ‐ chlorite ion Ca calcium ion ClO ‐ chlorate ion Co and Co cobalt ion ClO ‐ perchlorate ion Cr and Cr chromium ion CN ‐ cyanide ion Cu and Cu copper ion CO ‐ carbonate ion Fe and Fe iron ion C O ‐ oxalate ion K potassium ion CrO ‐ chromate ion Li lithium ion Cr O ‐ dichromate ion Mg magnesium ion HCO ‐ hydrogen carbonate or bicarbonate ion Na sodium ion H O hydronium ion Zn zinc ion HPO ‐ hydrogen phosphate ion H PO ‐ dihydrogen phosphate ion HSO ‐ hydrogen sulfite or bisulfite ion HSO ‐ hydrogen sulfate or bisulfate ion MnO ‐ permanganate ion N ‐ azide ion NH ammonium ion NO ‐ nitrite ion NO ‐ nitrate ion O ‐ peroxide ion OCN ‐ cyanate ion OH ‐ hydroxide ion PO ‐ phosphite ion PO ‐ phosphate ion SCN ‐ thiocyanate ion SO ‐ sulfite ion SO ‐ sulfate ion S O ‐ thiosulfate ion