Question

what is the overall polarity of this particle? polar nonpolar

Explanation:

The carbonate ion ($CO_{3}^{2 - }$) has a trigonal - planar molecular geometry. In a trigonal - planar geometry, the bond dipoles (due to the polar $C - O$ bonds) cancel each other out. This is because the symmetry of the trigonal - planar shape means that the vectors representing the bond dipoles sum to zero.

Answer:

nonpolar