What are polyatomic ions? Give examples.

Explanation

Those ion s which are formed from groups of joined atoms are called polyatomic ions. For example, ammonium ion, `NH_(4)^(+)` is a polyatomic ion which is made up of two types of atom, nitrogen (N) and hydrogen (H) joined together. Similarly, carbonate ion `CO_(3)^(2-)` , sulphate ion `SO_(4)^(2-)`, nitrate ion ` NO_(3)^(-)` and hydroxide ion `OH^(-)`, are all polyatomic ions.