| Question |
Answer |
| Assigning oxidation numbers | For an atom in its elemental form, the oxidation number is always zero |
| assigning oxidation numbers | For any monatomic ion the oxidation number equals the charge on the ion |
| assigning oxidation numbers | Nonmetals usually have negative oxidation numbers, although they can sometimes be positive |
| assigning oxidation numbers | The sum of the oxidation numbers of all atoms in a neutral compound is zero. The sum of the oxidation numbers in a polyatomic ion equals the charge of the ion |