Among others, the周期性tablecan provide practical information about the oxidation state of an element (Figure 1). This number is defined as the formal charge on the atom if all bonds were assumed to be fully ionic. Knowing the oxidation number or state is very useful for example when balancing reduction-oxidation (redox) reactions.

The view of periodic table with oxidation numbers for elements in group 1,2 and from groups from 13 to 17. Elements in group 1, from period 1 to 7, are metals - except hydrogen in period 1, with oxidation number +1. Elements in group 2, from period 2 to 7 are metals, with oxidation number +2. Elements in group 13, from period 2 to 7 are metals - except Boron, with oxidation number +2. All Elements in group 14 have oxidation number + - 4. All Elements in group 15 have oxidation number -3. All Elements in group 16 have oxidation number -2, except Livermonium in period 7, with oxidation number -3. All Elements in group 17 have oxidation number -1. Finally, all Elements in group 18 have oxidation number 0.

图1:Oxidation states in the Periodic Table.

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