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Rules have a priority order. So rule #1 > rule #2 > rule #3 and so on.
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#1. All pure elements and compounds have an oxidation number of _
zero
#2. The oxidation number of an ion is _______ as its charge
the same
#3. Fluorine has an oxidation number of _
-1
#4 Oxygen has an oxidation number of _
-2
#5 Hydrogen has an oxidation number of _
+1