1. Counting Atoms in Unit Cells:
Inside: 1
Face: ½
Edge: ¼
Corner: 1/8

5. When silver crystallizes, it forms face-centered cubic cells
When silver crystallizes, it forms face-centered cubic cells. The unit cell edge length is 409 pm. Calculate the density of silver.

6. Unit Cells, Dimensions and Measurements:
Ca metal:
Face centered cubic unit cell
Density = 1.54 g/cm3
What is the radius of a Ca atom?

7. What fraction of a simple cubic unit cell is filled with atoms?
What fraction of a face-centered cubic unit cell is filled with atoms?

9. Extra distance =
BC + CD =
2d sinq
= nl
(Bragg Equation)

10. X rays of wavelength nm are diffracted from a crystal at an angle of Assuming that n = 1, what is the distance (in pm) between layers in the crystal?

11. Summary of types and properties of crystals