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Unstable, because oxygen is a diatomic element meaning that O (charge of -2) cannot stand alone, when not in a compound it must be O2. So it has a charge of -4.
Nitrogen, in the form of N2 (which is the gas present in the atmosphere), is incredibly inert. That is to say, it's stable- it doesn't really want to react with anything anymore. When you breathe in N2, you breathe out N2. It hasn't changed and hasn't been absorbed by your body (at least in any significant way).