Rules for Naming Ions Negative ions--Anions 3.Polyatomic anions containing oxygen have names ending in -ate or -ite NO,:nitrate ion SO:sulfate ion NO,:nitrite ion SO:sulfite ion CIO:perchlorate ion C103: chlorate ion C102: chlorite ion ClO:hypochlorite ion3. Polyatomic anions containing oxygen have names ending in –ate or –ite 2 4 2 3 : : SO sulf ion SO sulf ate ite ion   3 2 : NO : nitr ion NO nitr ate ite ion   4 3 2 : : : : ClO chlor ion ClO chlor ion ClO chlor io per ate ate ite h n ClO ypochlorite ion    