Rules for Calculating Oxidation State
1. The charge on the molecule gives the total oxidation state for the molecule. Elements have an oxidation state of zero.
2. Group 1 elements have an oxidation state of +1, group 2 elements, +2.
3. Group 7 elements usually have an oxidation state of -1, but this can change depending on what it is bonded to.
4. Group 6 elements usually have an oxidation state of -2, except for peroxides or when bonded to halogens, where the oxidation states are -1 and +2 respectively.
5. Hydrogen atoms usually have an oxidation state of +1, except hydrides, which have an oxidation state of -1.
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