Polyatomic ions consist of multiple atoms bonded together, whereas single-charged ions are either single atoms or simple molecules with a net charge.
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A polyatomic ion is a group of atoms that carries a net electrical charge.
Sodium chloride (NaCl) is a classic example, with positively charged sodium ions (Na+) and negatively charged chloride ions (Cl–).
An anion is a negatively charged ion, while a cation is a positively charged ion.
Ions are composed of atoms, either singly or in groups, that have a net electrical charge.