1. The lattice atoms tend to slip via the closed-packed direction line in the closed packed planes. Consider a metal in Body-Centered Cubic (BCC) structure. (a) Estimate the linear density on [100], [110], and [111] directions. According to the theoretical calculation result, determine the closed-packed direction. ) Estimate the planar density on (100), (110), and (111) planes. According to ne theoretical calculation result, determine the closed-packed plane. (c) Estimate the atomic packing factor. (d) Why most metals are not in BCC structure? Briefly explain your answer. (e) Why most metals transfer to BCC structure at a higher temperature? Briefl explain your answer. [15 points]