Formula and structure of the carbonate?

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SUMMARY

The formula for the carbonate ion is CO3 with a charge of -2. Carbonate is a polyatomic ion commonly found in compounds such as potassium carbonate (KCO3) and sodium carbonate (Na2CO3). The molecular structure of carbonate is trigonal planar, featuring four bonds to the central carbon atom: two double bonds to one oxygen atom and two single bonds to two other oxygen atoms. The structure typically illustrates the two negative charges located on the oxygen atoms.

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can anyone tell me what is the formula and structure of the carbonate? i am very confused about this.is it bond by covalent bond ?
 
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Carbonate is a polyatomic ion. The formula is CO3 with a charge of negative 2. You most often find it as KCO3 or Na2CO3. The structure is trigonal planar, with four bonds to carbon, two of which are doubly bonded to one oxygen atom, and the other two bonded to one oxygen atom each. Usually the structure is drawn with the two negative charges on oxygen.
 
thanks a lot
 

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