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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.
For example: H2O can act as an acid or a base. OH (negative 1 charge) is the conjugate base if H2O is an acid (placed in a pH above 7 and loses a proton). H3O (positive 1 charge) is a conjugate acid if H2O acts as a base(placed in a pH below 7 and gains a proton). Source(s):