Lets say I want to find the oxidation numbers of a formula.
Oxygen has a 2- charge. They're 3 of them, so its 6-
Hydrogen has a 1+ charge. They're 3 of them, so its 3+.
So Arsenic must have a charge of 3+ for all the charges to add up to be 0? Correct?
However, my professor keeps telling me to keep the positive oxidation numbers away from each other. Is that a rule when writing a formula?
I thought it only applied when drawing Lewis structures or resonance structures.
Thanks for your input.