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Sodium Sulfide does not contain a polyatomic ion.
What do you mean by Polyatomic ion?
A covalently bound collection of two or more atoms or of a metal complex that may be said to behave as a single unit and that has a net charge that is not zero is referred to as a polyatomic ion or a molecular ion. Depending on the terminology employed, a polyatomic ion may or may not be referred to as a molecule. Greek word poly- means "many," although even ions made of just two atoms are frequently referred to be polyatomic.
A polyatomic ion may also be referred to as a radical in earlier literature (or less commonly, as a radical group). The word "radical" is now used to describe a variety of free radicals, which are entities that have an unpaired electron and need not be charged.
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