Drag the labels to their respective targets
Use the model mode in the PhET simulation...
Use the model mode in the PhET simulation to go through the various types of structures that can be made by forming and breaking bonds. the coordination around the central atom can range from 0 to 6, but the geometries that are of interest arise from coordination numbers of 2.6. you can click the molecule Geometry checkbox to have the geometry of the currently draw structure displayed on screen.