1. Look up the crystallographic data for NaCl on Wikipedia. State the crystal structure, Pearson Symbol, H-M Space Group, and lattice constant. 2. How does the atomic arrangement in the Caf, structure (as shown in the lecture material) differ from that of the NaCl structure? 3. Why do atomic sizes decrease when moving left to right along a row on the periodic table? 4. Draw the (211) plane on a standard set of x,y,z coordinates. 5. Will the (211) plane produce an X-ray diffraction peak in the FCC structure? Why or why not? 6. Calculate the 2q angle of the diffraction peak for the (222) plane in Pb (FCC), given the X-ray wavelength is 0.1542 nm and the lattice parameter a is 0.495 nm. 7. What are the two types of interstitial spaces in the FCC structure? 8 Briefly state the 4 Hume-Rothery rules that give guidelines on the likelihood of substitutional solid solubility of 2 metals. A lead-tin alloy has a mole fraction Pb of 0.74. Convert this to weight percent (wt%) Pb. (You will need to get the atomic weights of Pb and Sn from a periodic table.) 10. Describe the procedure for determining average grain size using the Linear Intercept method