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  • Write Lewis structure of O_2^– ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

Write Lewis structure of O_{2}^{-} ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

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Lewis structure of O_{2}^{-} is O-O^{-}.  

Oxygen atom with no any charge has 6 electrons and Oxidation number O.N: 0. 

but the other oxygen atom has 7 electrons and O.N: -1.

So, the average oxidation state is -1/2.

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