ODD (i.e.top) PROBLEMS:

1. 
   What is the name of this unit cell?
   1. Body-Centered Cubic (BCC)
   2. Face-Centered Cubic (FCC)
   3. Hexagonal Closest Packed (HCP)
   4. Cubic Closest Packed (CCP)
   5. B and D
   ANSWER: This unit cell is Face-Centered Cubic (FCC) which is one of two Cubic Closest Packed (CCP) unit cells (the other being Hexagonal Closest Packed, HCP). Therefore, E is the most correct answer.

   
   

2. How many atoms are in this unit cell?
   1. 2
   2. 3
   3. 4
   4. 5
   5. 6
   ANSWER: Two - because one eighth of each of the corner atoms are "in", and the center atom is completely inside giving a total of two, A.

3. Copper, an FCC metal, has an atomic radius of 1.28Å. Calculate the volume of the unit cell.
   1. 47.5 ų
   2. 41.1 ų
   3. 38.8 ų
   4. 26.2 ų
   5. 52.4 ų
   ANSWER: It`s 47.5 ų. Remember that the face diagonal is 4r, so that the cell volume will be (4r/2^1/2)³. A.

4. Silicon has a diamond unit cell. How many atom are inside it?
   
   1. 4
   2. 6
   3. 8
   4. 10
   5. 12
   ANSWER: It`s 8 - because the FCC unit cell contains four atoms, and four additional atoms are inserted into tetrahedral holes in order to obtain the diamond unit cell, C.

EVEN (i.e. bottom) PROBLEMS:

1. 
   How many atoms are in this unit cell?
   1. 2
   2. 4
   3. 8
   4. 10
   5. 12
   ANSWER: Four - It`s FCC: One eighth of each of the corner atoms are "in", and half of each of the face atoms giving a total of four, B.

2. 
   What is the name of this unit cell?
   1. Body-Centered Cubic (BCC)
   2. Face-Centered Cubic (FCC)
   3. Hexagonal Closest Packed (HCP)
   4. Cubic Closest Packed (CCP)
   5. B and D
   ANSWER: Body-Centered Cubic (BCC), A.

3. Silver, an FCC metal, has an atomic radius of 1.45Å. Calculate the volume of the unit cell.
   1. 78.5 ų
   2. 61.2 ų
   3. 69.0 ų
   4. 58.0 ų
   5. 116.0 ų
   ANSWER: It`s 69.0 ų. Remember that the face diagonal is 4r, so that the cell volume will be (4r/2^1/2)³. C.

4. How many tetrahecral holes exist in one FCC unit cell?
   
   1. 2
   2. 4
   3. 8
   4. 6
   5. 10
   ANSWER: Eight - four in the bottom half, and another four in the top, C.