Answer:
None, if it is pure. It is a simple ionic compund.
An molecule is a chemical species with at least one covalent bond. Sodium chloride is ionic, and doesn’t even have “molecular” or “polyatomic” ions (charged covalent molecules).
A single collection of the lowest “net neutral” integer ratio of anion and cation would be called a “formula unit” : Example, NaCl, Mg(OH)2 , etc
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