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Corner atom
1/8 atom
Face atom
1/2 atom
Body atom
1 atom
Simple Cubic (SC)
1 atom
Face-Centered Cubic (FCC)
4 atoms
Body-Centered Cubic (BCC)
2 atoms
1 pm
10⁻¹⁰ cm
Which type of unit cell has the highest packing efficiency?
Face-centered cubic (FCC)
A metal crystallizes in a body-centered cubic structure with an atomic radius of 125 pm. What is the edge length of its unit cell in pm?
Approximately 288 pm (using the formula a = 4r/√3)
What is the coordination number of an atom in a face-centered cubic (FCC) unit cell?
12
Which of the following statements about crystalline solids is true? (A) Amorphous solids have a well-defined repeating structure. (B) Body-centered cubic structures have a lower packing efficiency than face-centered cubic structures. (C) The density of a solid is independent of its crystal structure. (D) In a simple cubic unit cell
atoms are located only at the edges.
What fraction of an atom is shared at the corner of a simple cubic unit cell?
1/8
