Name: 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 cach. Show the model to the instructor Species Lewis structure Electron geometry Molecular geometry Valence Show angles Dipole moment (polar or not) (if any) HS Tetrahedral electrons Bent 8e H-3-H 109 Polar COM BCI , HO Page 44 Name: CHE NO, HCN SeCi PBC Page 45 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? Page 46