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istoleyobrownie
CaCo3, because CO3 is carbonate, which is three oxygens covalently bonded to the carbon. It has a charge of 2- becuase carbon has 4 electrons and the 3 oxygens bring 6. 

Rawrtothesome
A. CaCo3 should be correct


Calcium carbonate has both ionic and covalent bonds. It's a compound of carbon and oxygen, which are both non-metals, so are covalently bonded.

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