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2. Metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287pm. The density of iron is 7.87g/cm3. How many iron atoms

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2. Metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287pm. The density of iron is 7.87g/cm3. How many iron atoms are within a unit cell? 3. Lead crystallizes in a face-centered cubic unit cell with an edge length of 495pm. What is the radius of a lead atom in picometers? What is the density of lead in g/cm3

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