ion is an example of a polyatomic cation.

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Solution

In a sodium ion ( ${N a}^{+}$ ) and lithium ion ( ${L i}^{+}$ ), the positive charge is present only on a single atom. So, they are the examples of monoatomic cations.

Whereas, the ammonium ion ( ${N H}_{4}^{+}$ ) consists of a group of atoms carrying a postive charge on them. Hence, it is an example of a polyatomic cation.

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