CHEM101 Study Guide - Dan Piraro, Atomic Radius, Zinc Sulfide

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

4 particle per edge contribution is sections 12. 6, 12. 7 till and including p. 461. Read (p. 483 5th ed. ) (electronic materials, liquid crystals, ceramic materials) Practice ps #6 you should be able to do q 1 5, 7, 8. We assume that the particles themselves are spheres and not cubes. For particles of the same size, the higher the coordination of the crystal the greater the number of particles in a given volume. Both hexagonal closest packing, hcp, (based on hexagonal unit cell) and cubic closest packing, ccp, (based on fcc unit cell) provide 74% packing efficiency. A video clip for simple cubic, body centered cubic, face centered cubic, packing and the nacl and zns crystal structures was shown in class. I recommend that you view it or even download it. For nacl and zns, check for yourself that the empirical formula based on the number of particles in the unit cell matches the known formula.