Question

1. Aluminum and iron are both important structural metals. Suppose they are processed into the FCC and BCC structures. Of these four possible structures (FCC Al, BCC Al, FCC Fe, BCC Fe), which one has the a) lowest unit cell volume, and b) lowest theoretical density? The radius of Al is 0.1431 nm and the radius of Fe is 0.1241 nm.

2. An unknown metal has a BCC structure, density of 7.25 g/cm3, and atomic weight of 50.99 g/mol. Determine the atomic radius of the metal and its likely identify.

3. Niobium has an atomic radius of 0.1430 nm and a density of 8.57 g/cm3. Does it have an FCC or BCC structure

4. Draw the following unit cells and label each atom with its point coordinates:

a) BCC
b) FCC

Answer 1