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Oxygen usually exists in the form of diatomic molecules, meaning each molecule contains two oxygen atoms.

These molecules form because a lone oxygen atom is two electrons short of a full outer shell of 8. In order to fill its outer shell one oxygen electron will share electrons with another. Each oxygen atoms "gains" two electrons from the other. A total of 4 electrons are shared between them, 2 from each atom, creating a double covalent bond..

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