1)The oxidation number of any uncombined element is always 0.
2)The oxidation number of any uncombined ion is always the same as its charge.
3)The sum of all oxidation numbers in a molecule is 0.
4)Flourine always has an oxidation number of -1.
5)Hydrogen always has an oxidation number of +1, expect in metal hydrides when it is -1.
6)Oxygen has an oxidation number of -2, except in peroxides when it is -1.
7)Chorine always has an oxidation number of -1 except with oxygen and flourine when positive.
8)Group 1 elements always have +1, group 2 always +2, group 3 always +3 and group 7 always -1.
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