The sulfate ion is written as

Nitrate is a polyatomic ion that has a formula that looks like

Acetate has a formula of

Ammonium is a cation. It has the formula

Sodium hydrogen carbonate is baking soda. It contains the polyatomic ion, hydrogen carbonate. Hydrogen carbonate is based on the polyatomic ion carbonate. Carbonate is written as

Cyanide compounds are used quite often in Agatha Christie novels as a means of murder. As an anion, cyanide is written

Hydroxide is usually an indication of a compound being a base. Hydroxide as a polyatomic ion is written as

Chlorate is a common oxyanion of the halide group. Its formula is

Which ion is hypoiodite?