Rules for Assigning an Oxidation Number (O

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Rules for Assigning an Oxidation Number (O.N.) for Specific Atoms or Periodic Table Groups

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Rules for Assigning an Oxidation Number (O.N.) for Specific Atoms or Periodic Table Groups 
1. For Group 1A(1): 2. For Group 2A(2): 3. For hydrogen: 
4. For fluorine: 
5. For oxygen: 
6. For Group 7A(17): 
O.N. = in all compounds O.N. = in all compounds O.N. = in combination with nonmetals O.N. = in combination with metals and boron O.N. = in all compounds O.N. = in peroxides O.N. = in all other compounds (except with F) 
O.N. = in combination with metals. nonmetals (except 0). and other halogens lower in the group.