Atomic Structure and Packing Factors

This video tutorial covers solving problems related to atomic packing factors, unit cell volumes, and theoretical densities. It begins with an introduction to the atomic packing factor for BCC structures, followed by a detailed calculation of the volume of the unit cell for aluminium. The tutorial concludes with a computation of the theoretical density of copper, comparing it with measured values. The instructor emphasizes the importance of referring to notes for detailed explanations and encourages students to practice the calculations independently.

What is the atomic packing factor for a BCC structure?

• 0.52

• 0.68

• 0.74

• 0.6

Which formula is used to calculate the atomic packing factor?

• Vs/Vc

• Vc/Vs

• Vs*Vc

• Vs+Vc

How many atoms are there in a BCC unit cell?

• 4

• 2

• 1

• 3

What is the atomic radius of aluminum used in the calculation?

• 0.200 nm

• 0.256 nm

• 0.143 nm

• 0.128 nm

What crystal structure does aluminum have?

• Simple Cubic

• BCC

• FCC

• HCP

What is the formula for the volume of a unit cell in an FCC structure?

• 2r^3

• 16r^3

• 4r^3

• a^3

What is the atomic radius of copper used in the density calculation?

• 0.200 nm

• 0.143 nm

• 0.128 nm

• 0.256 nm

What is the atomic weight of copper used in the theoretical density calculation?

• 58.5 g/mol

• 63.5 g/mol

• 60.5 g/mol

• 65.5 g/mol

What is the measured density of copper from the literature?

• 7.85 g/cm³

• 8.50 g/cm³

• 8.94 g/cm³

• 9.00 g/cm³

How many atoms are there in an FCC unit cell?

• 3

• 4

• 2

• 1