• A polyatomic ion is an ion composed of more than one atom.
  • Some of the most useful materials we work with contain polyatomic ions.
  • Many materials exist as simple binary compounds composed of a metal cation and a non-metal anion, with each ion consisting of only one type of atom.
  • Other combinations of atoms also exist, either larger ionic complexes or complete molecules.
  • The atoms of a polyatomic Ion are tightly bonded together and so the entire ion behaves as a single unit.
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