Recall: The face-centered cubic cell contains an atom in each of the face of the cube and an atom in each of the corners. It looks like this:
Edge Length: If r = radius of the sphere, then the diagonal d = 4r, since it spans through 2 spheres. We can express the length of the cube l in terms r, using Pythagorean theorem.
Platinum (atomic radius = 1.38 Å) crystallizes in a cubic closely packed structure. Calculate the edge length of the face-centered cubic unit cell and the density of platinum.
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