VSEPR introduces the rules for using valence shell electron pair repulsion theory to predict the shapes of simple molecules. First, the five spatial arrangements that accommodate symmetric distributions of from two to six pairs of electrons with minimum repulsion are shown in three dimensions. Next, bonding and non-bonding pairs of electrons are defined. The program illustrates the different repulsions between bonding and non-bonding electron pairs so that the shape of a molecule may be determined. A discussion of molecular polarity completes the program. An exhaustive chart of molecules representing all possible molecular shapes, from linear to octahedral, is continuously accessible to the user.

VSEPR Quiz allows students to practice identifying the correct arrangements of electron pairs surrounding a central atom, and, based on these arrangements, to predict the actual geometric shapes of simple molecules. This highly interactive quiz begins with a concise review of VSEPR rules and then the testing starts. Interaction is accomplished by dragging models across the screen or by clicking on the appropriate labels. Feedback is presented at every response.

http://www.cem.msu.edu/~gencem/vsepr/index.html