Question

Question #cd83e

Answer 1

The polyatomic ions 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