Question

define a poly atomic ion give one example of it

Answer 1

A polyatomic ion, also known as a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit. ... Polyatomic ions are often useful in the context of acid-base chemistry or in the formation of salts.

Examples are Nitrate ( NO3-1) , Sulphate(SO4-2) etc.

Answer 2

Answer:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.