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O2 is a molecule combined  of 2 oxygen atoms whereas 2O means 2 oxygen atoms are present
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Do you know any other difference bcuz I need 3 differences 
O2 is combination of two oxygen atoms which is nothing but a molecule.
In o2 oxidation state is 0.
But 2O is two nascent oxygen atoms which is unstable in nature.
whereas O2 is stablr in nature.
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