A polyatomic ion is a molecular ion; a covalent compound (formed from multiple atoms from different elements) with a charge. A monoatomic ion is an ion composed of a single atom.

The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.

Let's review the common polyatomic ions, and look at the common suffixes and prefixes to help remember the formulas.

Reviewing the common polyatomic ions, and explaining common suffixes and prefixes to help remember the formulas.

Reviewing the common polyatomic ions, and explaining common suffixes and prefixes to help remember the formulas.

Like single-atom ions, polyatomic ions form when electrons are gained or lost, giving the entire group a positive or negative charge. Even though they are made of multiple atoms, they act as a single unit in …

The formula for the sulfate ion is SO A 4 A 2 . Based on this information, which two formulas below represent neutral compounds?

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Learn how to name positive ions (cations), negative ions (anions), and ionic compounds involving main group elements.