The Shape of Molecules Purpose: Determine polarity of molecules. Check out a molecular model kit from the stock room. Check that the kit contains linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries 1. Complete the following table and build the model for each. Show the model to the instructor Species Lewis structure Electron geometry Molecular geometry Valence Show angles Dipole moment(polar or not) (if any) electrons HS Tetrahedral Bent H-3-H 8e 1090 Polar CO BCI, , H2O Name: CH NO, HCN SeCl PBry Name: Questions: 1. Write the Lewis structure for ammonium ion. Determine electron and molecular geometries 2. Write three resonance structures for the nitrate ion. Determine electron and molecular geometries. 3. What determines: a) the electron geometry and b) the molecular geometry of molecules or ions