We are asked to determine the number of aluminum atoms in a face-centered cubic unit cell.
A unit cell is the smallest portion of a crystal lattice.
A cubic unit cell has 8 corners, 6 faces, and 1 center. An atom placed in each point occupies a certain fraction of the volume of the cube:
• Corner → 1/8 of the atom is inside the cubic unit cell
• Face → ½ of the atom is inside the cubic unit cell
• Center → 1 whole of the atom is inside the cubic unit cell
Aluminum metal crystallizes in a face-centered cubic unit cell.
How many Aluminum atoms are in a unit cell?
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