What polyatomic ions end in -ide?

The that end in -ide include, ##OH^-## hydroxide, ##O_2^-## peroxide, ##CN^-## cyanide, ##NH_2^-## amide and ##HS^-## hydrogen sulfide.

The -ide suffix, is usually reserved for monatomic anions.

Non-metal ions like oxygen, fluorine and chlorine take on the -ide and become oxide, fluoride and chloride.

Most of the polyatomic ions end in -ite and -ate. ##NO_3^-## nitrate, ##ClO_2^-## chlorite, etc…

The positive monatomic ions keep their common name, however metals can use the -ic and -ous suffixes in ##Fe^(+2)## ferrous and ##Fe^(+3)## ferric, etc...

There is one positive polyatomic ##NH_4^-## ammonium which uses the -ium suffix.

I hope this was helpful. SMARTERTEACHER