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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.
Most of the stabilized oxygen solutions that were sold in the 1980s and 1990s contained chlorine dioxide (or chlorite) molecules where two oxygen atoms were bonded to a single chlorine molecule (ClO2-). This solution is extremely alkaline (pH 12 or more) and is very caustic.