Which of the following choices represents a natural state with an oxidation number equal to 0? All right, Remember when you're in your natural state as an element, your oxidation number oxidation state will equal 0.
If we take a look here, we have Na3, Cl2, He, and Mn4. Remember that when it comes to chlorine, chlorine exists as a diatomic molecule, so Cl2 is its natural state. So this would not have an oxidation number equal to 0.
Here Na3, three and Minnesota. These are two metals. Remember these metals exist as monoatomic elements in their natural states so this wouldn't work and this wouldn't work.
The answer here is C because helium here is shown in its natural state and as a result of this would have an oxidation number equal to 0. So here option C is the correct answer.
