Reviewin g Main Ideas 1. What two theories can be used to predict molecular geometry? 2. Draw the Lewis structure and predict the mo- lecular geometry of the following molecules: a. SO_(2) b. Cl_(4) c. BCl_(3) 3. What factors affect the geometry of a molecule?

1. The two theories that can be used to predict molecular geometry are the Valence Shell Electron Pair Repulsion (VSEPR) theory and the Electron Domain Theory.<br /><br />2. <br />a. The Lewis structure for $SO_{2}$ is:<br /><br />```<br /> O=S=O<br />```<br /><br />The molecular geometry of $SO_{2}$ is bent or V-shaped.<br /><br />b. The Lewis structure for $Cl_{4}$ is:<br /><br />```<br /> Cl<br /> |<br />Cl-Cl-Cl<br /> |<br /> Cl<br />```<br /><br />The molecular geometry of $Cl_{4}$ is tetrahedral.<br /><br />c. The Lewis structure for $BCl_{3}$ is:<br /><br />```<br /> B<br /> |<br />Cl-Cl<br /> |<br /> Cl<br />```<br /><br />The molecular geometry of $BCl_{3}$ is trigonal planar.<br /><br />3. The factors that affect the geometry of a molecule are the number of electron pairs (bonding and non-bonding) around the central atom, the repulsion between these electron pairs, and the presence of any lone pairs on the central atom.