The criteria for determining the oxidation numbers The details are as follows
: 1. atoms that is free of all kinds of oxidation number zero. That element is a single atom or atoms, such as N2, Hg and S8, etc.
2. Metals Group 1A and 2A ranks among 3A when in solution or compound to an oxidation number is +1, +2 and +3 respectively. Na +, Ba + 2, Al + 3, etc.
3. oxygenated compounds mainly oxidation number -2, except oxygen in peroxide compounds such as H2O2 -1 oxidation number of oxygen in a compound superoxide oxidation number - ½ as KO2. oxygen and oxygen compounds fluoride (OF2) with a +2 oxidation
4. Hydrogen sulfide oxidation number is +1, but most of the hydride compound. Hydrogen oxidation number -1 as CaH2, LiAlH4, NaBH4
5. Harry halides ions in the compound to oxidation number -1 as NaCl, HI, but when combined with oxygen will have a positive oxidation compounds such as Cl in KClO3
6. ion with a single atom The oxidation number of ions ions such as Al3 +, S2-
7. In neutral molecules. The sum of the oxidation numbers of all operators is equal to zero. If the molecule is the sum of the oxidation of iron ions in a molecule that is equal to the charged ions of the molecule.
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