Enter the oxidation number with the sign above each element

H2

OH^-

Mg^2+

CO3^2-

3 answers

Learn the rules. Here is a site to help you. I'll be glad to check your answers.
(Broken Link Removed)
What is the name for the chemical formula Ba(CH3CO2)2 (all the numbers are smaller and at the bottom of the compound, I just do not know how to type them)
The compound you typed is named barium acetate. In the future, instead of piggy backing on another post, which usually results in your questions getting overlooked, please go to the top of the page, click on Ask a New Question, and type a your question. That will get quicker and better results.