A polyatomic ion has two or more covalently bonded atoms that act as a single ion. The polyatomic ion forms ionic bonds with other ions and acts externally as a unit, just like monatomic ions.

How do polyatomic ion charges work?

In a polyatomic ion, the group of covalently bonded atoms carries a net charge because the total number of electrons in the molecule is not equal to the total number of protons in the molecule.

What polyatomic ion is io3?

Iodate is an iodine oxoanion and a monovalent inorganic anion.