1.1: Overview This exercise seeks to help you reinforce the concept of molecular and electronic geometry and visualize molecules in 3-dimensions. To do this we will be introducing the use of Avogadro, an open-source program designed to edit and draw molecules in 3-dimensions. This program will allow us to estimate geometries and measure bond lengths and bond angles. We will then compare these bond angles and molecular geometries to those predicted using valance shell electron pair repulsion theory (VSEPR). 1.2: Background Atoms within an organic molecule can adopt a variety of differing geometries based upon the number and type of bonds that they contain as well as the number of non-bonding electrons that they have. One of the methods that organic chemists use to determine the geometry of atoms in a molecule is Valence Shell Electron Pair Repulsion (VSEPR). This method puts the bonding and non-bonding electrons in a molecule into groups. 1.3: Computational Instructions In this exercise we will learn to draw simple molecules in Avogadro, an open-access molecular visualization software package. 1.4: Exercise Questions