The Solid State

Question 1

CsCl structure

Radius Ratio?

Answer 1

Most stable 1:1 structure for radius ratios above 0.717.

Question 2

Zinc Blend

Radius Ratio?

Answer 2

Most stable 1:1 structure for radius ratios lower than 0.414.

Question 3

Rock Salt Structure

Radius Ratio?

Answer 3

Most stable 1:1 structure for radius ratios
between 0.326 and 0.717.

Question 4

The allowed size of the cation for a given structure is determined by________.

Answer 4

the critical radius ratio

Question 5

The distinction between the laying of a hexagonal close packed structure vs a cubic close packed structure is_____.

Answer 5

ABAB (HCP)

ABCABC (CCP)

Question 6

This unit cell has one atom located at each of the corners of the cube and one at the center of each face.

(Important: all atoms are the same (e.g. Cu and Au)

Answer 6

Face-centered cubic

Question 7

This unit cell has one atom in the center of the unit cell and eight corner atoms.

(Important: all atoms are the same (e.g Fe))

Answer 7

Body-Centered Cubic

Question 8

Ionic Solids

The number of nearest neighbor S atoms coordinated to Zn in ZnS cystal lattice?

Answer 8

4 (coordination number)

Question 9

Ionic Solids

The number of nearest neighbor Na⁺ coordinated to Cl^- in NaCl cystal lattice?

Answer 9

6 (coordination number)

Question 10

Ionic Solids

The number of nearest neighbor Cl^- coordinated to Na⁺ in NaCl cystal lattice?

Answer 10

6 (coordination number)

Question 11

Closed Packed Structure

The coordination number of each atom in a cubic close packed structure.

Answer 11

12 (e.g. 12 vertices)

Question 12

Closed Packed Structure

The coordination number of each atom in a hexagonal close packed structure.

Answer 12

12 (e.g. 12 vertices)

Question 13

Closed Packed Structure

Identify the following type of hole in the closed packed structure below.

Answer 13

Octahedral Hole

Question 14

Closed Packed Structure

Identify the following type of hole in the close packed in the structure below.

Answer 14

Tetrahedral holes

Question 15

Every equivalent atom on an edge of the unit cell counts____.

Answer 15

1/4

Question 16

Every equivalent atom on a face of the unit cell counts____.

Answer 16

1/2

Question 17

Every equivalent atom inside the unit cell counts____.

Answer 17

1

Question 18

The class of primitive unit cell below?

Answer 18

Orthorhombic

Question 19

The class of primitive unit cell below?

Answer 19

Monoclinic

Question 20

The class of primitive unit cell below?

Answer 20

Triclinic

Question 21

The class of primitive unit cell below?

Answer 21

Cubic

Question 22

The simplest repeating unit in a crystal

Answer 22

Unit Cell