Inorganic Chemistry pt.2

What is the primary difference between metals and nonmetals in terms of band theory?

• Metals have widely separated energy bands.

• Nonmetals have overlapping energy bands.

• Metals have overlapping energy bands.

• Nonmetals allow free movement of electrons.

What is an intrinsic semiconductor?

• A material with a large band gap.

• A material with a small band gap.

• A material with an impurity band.

• A material that prevents electron movement.

What is the coordination number in simple cubic packing?

• Four

• Six

• Eight

• Twelve

In body-centered cubic packing, how is the second layer arranged?

• Over the first layer

• Over holes in the first layer

• Over the third layer

• Over the sides of the first layer

In a hexagonal arrangement, how many neighbors surround each atom in the same plane?

• Four

• Six

• Eight

• Ten

What is the packing arrangement called when a third layer is placed over the holes of the second layer in hexagonal packing?

• Cubic packing

• Tetragonal packing

• Hexagonal close-packed (hcp)

• Orthorhombic packing

In hexagonal packing, what percentage of the crystal volume is filled with atoms if the occupancy is 60 percent?

• 40 percent

• 50 percent

• 60 percent

• 70 percent

What does a higher occupancy percentage indicate in crystal structures?

• A less dense arrangement of atoms

• A denser arrangement of atoms

• More empty space

• Fewer atoms

What is the coordination number for a body-centered cubic (bcc) structure?

• 6

• 8

• 12

• 14

In a simple cubic unit cell, how many one-eighth atom segments are there?

• 4

• 6

• 8

• 10