Answer the following question given this paragraph: 

Monatomic ions have an oxidation number equal to their charge. Li + has an oxidation state of +1, Ba 2+ has an oxidation state of +2, I - has an oxidation state of -1, and so on.


Q: Monatomic ions have an oxidation number equal to their what?

 Choices:

- size

- cost

- length

- charge

A:
charge
