What are the key principles to consider when determining oxidation numbers, as outlined in the oxidation number rules chart?

When determining oxidation numbers, consider the following key principles from the oxidation number rules chart:

1. The oxidation number of an element in its elemental form is 0.
2. The oxidation number of a monatomic ion is equal to its charge.
3. In compounds, the sum of oxidation numbers must equal the overall charge of the compound.
4. Hydrogen has an oxidation number of 1 in most compounds, except in metal hydrides where it is -1.
5. Oxygen typically has an oxidation number of -2 in compounds, except in peroxides where it is -1.
6. Group 1 metals have an oxidation number of 1, and Group 2 metals have an oxidation number of 2.
7. Fluorine always has an oxidation number of -1 in compounds. Remember these principles when determining oxidation numbers.