Respuesta :

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NaHCO3 since it is made up of multiple elements and is not an ion.
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Answer:

4.) NaHCO3

Explanation:

In a compound, two or more elements are chemically combined. NaHCO3 is a compound containing the elements sodium (Na), hydrogen (H), carbon (C), and oxygen (O). N2 and Na are elements. NH4+ is the polyatomic ion ammonium.Zoom