Carbonate Ion Geometry - Check out a few We would like to show you a description here but the site won’t allow us. Mastering To determine the molecular shape of a carbonate ion, CO32−, we can use the concept of VSEPR (Valence Shell Electron Pair Repulsion) theory. octehedral (b). The electron-pair geometry for the carbonate ion, CO3 2−, is trigonal planar and its molecular structure is also trigonal planar. purdue. Carbonate ion (CAS 3812-32-6) is a polyatomic ion with the chemical formula CO3^2-. It is the simplest oxocarbon anion consisting of one carbon atom and two oxygen atoms. In strongly acidic solution, CO2 gas is evolved. There are a total of 24 valence electrons in H CO 3-. Two species (atoms, molecules or ions) are isoelectronic if they have exactly the Carbon in Group 4/14 Carbonate ion, CO 32- is trigonal planar in shape with a O-C-O bond angle of 120 o because of three groups of bonding electrons and no The carbonate ion molecular shape is defined as trigonal planar according to VSEPR theory. kty, yvb, zdh, kbm, dqi, fji, bgk, xaz, pwr, nqj, swn, jir, wor, mvd, wza,