Valency of carbonate ion....?

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Dr Ashok Gopalakrishnan

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So, each carbon atom has 4 valence electrons (because it's in the 4th column of the periodic table). Each Oxygen atom has 6 valence electrons because it's in the 6th column. Also, the overall negative charge of -2 indicates that there are two more electrons even than that. 4*1 + 3*6 + 2 = 24
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Carbonate is (CO3)2- so, the valency will be 2-
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Carbonate is a divalent negative radical. Its valency is 2-
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The valency of carbonate is -2.
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