18 Questions
In a Body Centered Cubic (BCC) unit cell, how many atoms are present?
2 atoms
Which of the following is a characteristic of a Body Centered Cubic (BCC) unit cell?
An atom at the center of the cube 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?
1 unit cell
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)
What is the total number of atoms in a Body Centered Cubic (BCC) unit cell?
2 atoms
Which of the following is not a type of cubic system?
Edge Centered Cubic (ECC) Lattice
What is the total number of atoms in the simple hexagonal system (S.H.)?
8
What is the Atomic Packing Factor (APF) for the Face Centered Cubic (F.C.C.) structure?
0.74
How many atoms are present in the Hexagonal Closed Packed (HCP) system?
12
Which type of structure has the densest packing of atoms?
Face Centered Cubic (F.C.C.)
What does Amorphous mean in the context of materials?
Without shape or defined structure
How does a higher Atomic Packing Factor (APF) impact the properties of a material?
*Increases stability, *higher densities and *higher strength properties
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.
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.
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.
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.
Which of the following statements correctly describes crystalline solid dental materials?
Their atoms are regularly arranged in a space lattice.
What type of crystal structure is characterized by a body-centered cubic (BCC) arrangement of atoms?
Body-centered cubic (BCC)
Learn about the regular arrangement of atoms in space lattices and the concept of unit cells in crystalline structures. Explore the classification of unit cells based on the length of their axes and interfacial angles.
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