How many double bonds and single bonds are there in a carbonate ion?

The carbonate ion (CO3^2-) is a polyatomic ion with one carbon atom and three oxygen atoms.

Step 1: Draw the Lewis structure of the carbonate ion.

The Lewis structure of the carbonate ion shows that one oxygen atom forms a double bond with the carbon atom, while the other two oxygen atoms form single bonds with the carbon atom.

Step 2: Count the number of single and double bonds.

From the Lewis structure, we can see that there are two single bonds (C-O) and one double bond (C=O) in the carbonate ion.

So, the carbonate ion has 2 single bonds and 1 double bond.