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| Answer |
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| 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 |
HHS Shrek
