Space Lattices and Unit Cells in Crystalline Structures

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In a Body Centered Cubic (BCC) unit cell, how many atoms are present?

4 atoms

2 atoms (correct)

1 atom

3 atoms

Which of the following is a characteristic of a Body Centered Cubic (BCC) unit cell?

All interfacial angles are 90°

An atom at the center of the cube and 1/8 of an atom at each corner (correct)

All axis lengths are equal (a = b = c)

An atom at the center of each face and 1/8 of an atom at each corner

In a Body Centered Cubic (BCC) unit cell, how many unit cells share an atom at the corner?

4 unit cells

2 unit cells

8 unit cells

1 unit cell (correct)

Which of the following is not a characteristic of the Body Centered Cubic (BCC) unit cell?

The length of all three axes are equal (a = b = c) Signup and view all the answers

What is the total number of atoms in a Body Centered Cubic (BCC) unit cell?

2 atoms Signup and view all the answers

Which of the following is not a type of cubic system?

Edge Centered Cubic (ECC) Lattice Signup and view all the answers

What is the total number of atoms in the simple hexagonal system (S.H.)?

8 Signup and view all the answers

What is the Atomic Packing Factor (APF) for the Face Centered Cubic (F.C.C.) structure?

0.74 Signup and view all the answers

How many atoms are present in the Hexagonal Closed Packed (HCP) system?

12 Signup and view all the answers

Which type of structure has the densest packing of atoms?

Face Centered Cubic (F.C.C.) Signup and view all the answers

What does Amorphous mean in the context of materials?

Without shape or defined structure Signup and view all the answers

How does a higher Atomic Packing Factor (APF) impact the properties of a material?

*Increases stability, *higher densities and *higher strength properties Signup and view all the answers

Which of the following statements about secondary forces (Van der Waals forces) is correct?

They arise from the polarization of molecules and the formation of electrical dipoles. Signup and view all the answers

Which of the following statements correctly describes a fluctuating dipole?

It is a temporary asymmetry in the distribution of electrons around the nucleus of an atom. Signup and view all the answers

Which of the following statements correctly describes a permanent dipole?

It is a type of dipole that exists in polar molecules like water due to the uneven distribution of electrons. Signup and view all the answers

Which of the following statements correctly describes the hydrogen bond in water molecules?

It is a weak attractive force between the positive hydrogen portion of one water molecule and the negative oxygen portion of another water molecule. Signup and view all the answers

Which of the following statements correctly describes crystalline solid dental materials?

Their atoms are regularly arranged in a space lattice. Signup and view all the answers

What type of crystal structure is characterized by a body-centered cubic (BCC) arrangement of atoms?

Body-centered cubic (BCC) Signup and view all the answers