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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.
OxygenLeveraging the combustion-sustaining, oxidising and life-supporting properties of oxygen across the widest range of industries. Oxygen (O2) is a colourless and odourless gas. It is vital for most life forms on earth. We absorb oxygen through the air we breathe. Medical oxygen is essential in hospital and clinical care for resuscitation and surgery and for various therapies. It is also mixed with nitrogen or helium to create underwater diving mixtures. Oxygen is obtained on a commercial scale through the liquefaction and distillation of ambient air at air separation plants.