what is the difference between O and O2 (2points)
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The common confusion here is that two very different things have the same name. O is a free oxygen atom and O2 is two oxygen atoms chemically bound to form an oxygen molecule.
There is no common analogy for C, but N2 is called nitrogen, H2 is hydrogen and Cl2 is chlorine, each having the same name as that of their constituent elements.
So, to reiterate, the difference between oxygen (O) and oxygen (O2) is that the former is an oxygen atom while the latter consists of two O atoms bound together, forming a molecule also called oxygen.
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