Ni metal crystallizes in two different unit cells, an fcc and a bcc. Why might N

Question

Ni metal crystallizes in two different unit cells, an fcc and a bcc. Why might Ni adopt a closest-packed arrangement at low temperature (fcc unit cell) but adopt the nonclosest-packed structure at higher temperature (bcc unit cell)? Please choose the answer that best explains your reasoning. At lower temperatures, the electrons have less energy and are capable of forming tighter bonds. At lower temperatures, the atomic radius decreases and the atoms can be packed more tightly O The lower temperature means that the atoms have lower kinetic energy, aren't moving as fast, so they can get closer together At higher temperatures, the air in the voids expands and forces the structure to adopt a nonclosest-packed structure

Explanation / Answer

Answer

At lower temperature, the atomic radius decresas and the atoms can be packed more tightly

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