The polyatomic carbonate ion is charged with a value of -2. Calcium carbonate has the chemical formula CaCO3. One carbon atom and three oxygen atoms make up carbonate,
A polyatomic carbonate ion contains 2 more electrons than protons due to its negative charge. Its propensity to combine with alkali and alkali earth metals to generate salt compounds distinguishes carbonate, a malleable polyatomic ion. Its propensity to combine with alkali and alkali earth metals to generate salt compounds distinguishes carbonate, a malleable polyatomic ion. Several different types of sedimentary rocks mostly consist of carbonate compounds, the most well-known of which being limestone, which is primarily made of calcium carbonate (CaCO 3).
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