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MSE2034hw2

# MSE2034hw2 - MSE2034 Homework#2 Max Score = 12/12 1 pt each...

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MSE2034 Homework #2 Max Score = 12/12. 1 pt each unless indicated. Due Thursday, January 28 1) On the basis of bonding types, explain why covalently bonded materials tend to be less dense than those with metallic or ionic bonds. 2) Using Eqn 2.10, compute the expected percent ionic character for the following compounds: (a) MgS, (b) GaAs, (c) CsF, (d) FeO. State whether each is best described as predominantly ionic, predominantly covalent, or mixed in bonding type. 3) Mathematically confirm that the atomic packing factor for BCC metals should be 0.68, using the approximation that atoms are hard spheres packed into a cubic unit cell. 4) Using information on atomic weight, crystal structure, and atomic radius tabulated on the inside cover of your text, compute the theoretical densities of (a) aluminum; (b) nickel; (c) tungsten; and (d) magnesium. Compare each of the values you obtain with the actual value cited in the same table. You can assume that the hexagonal magnesium unit cell has a c/a ratio of 1.624 (slightly off the ideal value of 1.633).
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