🤓 Based on our data, we think this question is relevant for Professor Griffith's class at UMD.
1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.) O.S. = 0
2. For an ion (Li+, Al3+, etc.) O.S. = charge
Assign oxidation states to each atom in each of the following species:
Ag, Ca2+, BaO, H2S, NO3-, CrO42-