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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.
Cobalt(2) or cobalt(II) is Co2+, or a cobalt atom with two units of positive charge. Hydrogen carbonate, or bicarbonate ion, is HCO3 -, or HCO3 with one unit of negative charge. Hence two units of hydrogen carbonate ion are needed to balance one unit of cobalt ion. Hence the answer is Co(HCO3)2.