A hypothetical metal has a simple cubic unit cell and its atomic radius is 1.167 Å. Calculate the edge length of the unit cell. A hypothetical metal has a face-centered cubic unit cell and its atomic radius is 1.738 Å. Calculate the edge length of the unit cell. A hypothetical metal has a body-centered cubic unit cell and its atomic radius is 1.677 Å. Calculate the edge length of the unit cell.