Q1. Calculate the theoretical densities of gold (Au) and silver (Ag), given that both metals have FCC crystal structure and atomic radii of 0.1442 nm for Au and 0.1445 nm for Ag (take atomic weights from the periodic table). (4 points)
Q2. Calculate the radius of an iridium atom given that Ir has an FCC crystal structure, a density of 22.4 g/cm3, and an atomic weight of 192.2 g/mol. (2 points)
Q3. Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. (2 points)
Q4. What is the composition, in atom percent, of an alloy that consists of 30 wt% Zn and 70 wt% Cu? Calculate the average density of the alloy. (4 points)
Q5. What is the composition, in weight percent, of an alloy that consists of 6 at% Pb and 94 at% Sn? Calculate the average density of the alloy. (4 points)
Q6. Which of these elements would you expect to form the following with iron (Fe): (a) A substitutional solid solution? (b) An interstitial solid solution?
Atomic Radius (nm): 0.1278, 0.071, 0.046, 0.060, 0.1445, 0.1431, 0.1253, 0.1249, 0.1241, 0.1246, 0.1376, 0.1387, 0.1332
Electronegativity: 1.9
Crystal Structure: FCC
Element: Cu, C, H, O, Ag, Al, Co, Cr, Fe, Ni, Pd, Pt, Zn
Valence: +2
FCC, FCC, HCP, BCC, BCC, FCC, FCC, FCC, HCP
1.9, 1.5, 1.8, 1.6, 1.8, 1.8, 2.2, 2.2, 1.6
+1, +3, +2, +3, +2, +2, +2, +2, +2
a = 0.2867 nm (4 points)