the only formula listed below that represents a polyatomic ion is

A. HCO3-
B. H2S04
C. C1-
D. Na+

I will be happy to critique your thinking on this.

Which formula listed below represents a polyatomic ion?

To determine which formula represents a polyatomic ion, we need to understand what a polyatomic ion is. A polyatomic ion is a charged particle composed of two or more atoms that are covalently bonded together.

In the given options, let's analyze each formula:

A. HCO3-: This is a polyatomic ion because it consists of more than one atom (H, C, and O) that are covalently bonded together. It also carries a charge of -1.

B. H2SO4: This is not a polyatomic ion because it does not consist of multiple atoms that are covalently bonded as a single charged particle. It represents a molecular compound, sulfuric acid.

C. Cl-: This is not a polyatomic ion either. It is a single atom of chlorine, carrying a charge of -1. It is called a monatomic ion.

D. Na+: This is also not a polyatomic ion. It represents a sodium cation, which is a single sodium atom with a +1 charge. It is also a monatomic ion.

Based on the explanations above, the only formula that represents a polyatomic ion is A. HCO3-.