4 Crystal

What is the purpose of defining a lattice in crystallography?

• To measure the crystal's hardness

• To calculate the crystal's weight

• To provide a framework for attaching a basis set of atoms

• To determine the color of the crystal

What is the significance of Bravais lattices in crystallography?

• They describe the basic crystal structure

• They affect the crystal's shape

• They determine the crystal's color

• They control the crystal's bonds

What is the coordination number for the first coordination shell in a simple cubic crystal structure?

• 12

• 8

• 6

• 4

Which crystal structure has a very high packing density and is common in materials like nickel and copper?

• Simple Cubic

• Body-centered Tetragonal (BCT)

• Face-centered Cubic (FCC)

• Body-centered Cubic (BCC)

How many Bravais lattices are there in 3D space?

• 32

• 64

• 230

• 14

What is the unit cell area defined by in 2D crystal lattices?

• A = a1 x a2

• A = a1 + a2

• A = a1 / a2

• A = a1 - a2

What is the basis set in crystallography?

• The geometric arrangement of atoms

• The lattice vectors

• The unit cell area

• The minimal set of atoms that reproduce the crystal structure

What is the purpose of a unit cell in crystallography?

• To determine the crystal's lenth

• To define the lattice

• To reproduce the entire crystal structure

• To measure the crystal's basis

What defines the repeating pattern in crystals?

• Lattice: geometric framework; Basis: repeated unit.

• Basis: geometric framework; Lattice: repeated unit.

• Only point and space groups define crystal patterns.

• Crystal patterns are random, without specific lattice or basis.

Which statement correctly matches elements to their crystal structures?

• Polonium is an example of a FCC structure, which is rare.

• Iron and tungensten are examples of SC structures, which are common.

• Nickel and copper are examples of BCC structures, which have a high packing density.

• Polonium is an example of a SC structure, and nickel and copper are examples of FCC structures.