Give symbols and valency of the following ions Of Hydroxide ions and Carbonate ions
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Carbonate is formed when Na2CO3 or CaCO3 or similar carbonate compound break-up into ions. Now, (CO3)2- i.e., carbonate ion can exist alone but only through resonance. You can say despite of having 2 valency in oxygen it gets 1.5 valency fulfilled and that's because of resonance.
Hydroxide ion that is OH is a compound made up of hydrogen and oxygen. To know the valency of an atom you need to understand the concept of electronegativity. Oxygen is more electronegative atom as compared to hydrogen, thus the oxygen atom has a charge of -2 whereas hydrogen atom has a charge +1. Thus OH has an overall charge of -1
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