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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.
Best Answer: Carbonic acid (H2CO3) is weak and unstabe since it can lose one proton to form bicarbonate anion (HCO3â) and lose a second to form carbonate anion (CO32â).Both Ka values are small.est Answer: Carbonic acid (H2CO3) is weak and unstabe since it can lose one proton to form bicarbonate anion (HCO3â) and lose a second to form carbonate anion (CO32â). Both Ka values are small.