Polar or nonpolar?

[needhelpperson]

Is the CO3(2-) carbonate ion polar or nonpolar? I know its a triagonal planar but it also has the double bond. please help.

[chem_tr]

The double bond is delocalized through its three resonance contributors, so I presume the molecule is nonpolar; the charge central is identical with the weight central (I don't know how to say these in English).

If there is an error, I'll correct though.

[Sirus]

I believe you are correct. All three bonds are actually of order 1.3333, rather than one bond being of order 2 and the others of order 1. This makes it a symetrical planar molecule, meaning it's nonpolar.