Students construct models of ionic solids in class and answer a series of questions about the structures.
Students can build a model of an ionic solid that is ccp or hcp anions with cations in the octahedral and/or tetrahedral holes.
Students can describe the solid (using the words hcp, ccp, and octahedral/tetrahedral holes).
Students can determine the empirical formula from the structure.
Students can look at an already constructed model (one that they did not build) and do these things.
Solid state model kits from ICE; at least 1 kit per 4 students. See "Solid State Model Kits" at the bottom of this page: http://ice.chem.wisc.edu/Catalog/SciKits.htm#Anchor-Solid-31140. I use the student version.
I adapted this from an exercise I got from Maggie Geselbracht. I typically have each group build NaCl in class for practice, then I assign them one of the structures on the worksheet, which they build in class. After that, we leave the structures out on a big countertop in the room, with the instruction book open to the appropriate page underneath, so they know which structure is which. Students are allowed to come in on their own time to complete the assignment.