Determine the electron geometry (eg), molecular geometry (mg), and polarity of so2.

The electron geometry is trigonal planar, the molecular geometry is also trigonal planar and the polarity of so2 is nonpolar. 
The answer in this question is; eg = trigonal planar,  mg = trigonal planar,  nonpolar.
Trigonal planar is a molecular geometry model in chemistry with one atom at the center and three atoms at the corners of an equilateral triangle, called peripheral atoms, all in one plane.

The formula is (nh4)2co3