Please explain Bookmarks Window Help smartwork.wwnorton.com ,General College Che

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Please explain Bookmarks Window Help smartwork.wwnorton.com ,General College Chemistry II, Chem 106, Fall 2017, Prof. Harris Notice: Full credit given to 5 removed questions. Periodic Table Ebook Question 3 of 7 (1 point) Ca metal crystallizes in two different unit cellis, an foc and a bcc. Why might Ca 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 oxweo tern'y erat ure sstms have lower kinetic energy, aren't moving temperatures, the air in the voids expands and forces the structure to adopt a non her ed structure O Hint Check Answer View So

Explanation / Answer

At low temperature, the kinetics energy is low so the vibration of atoms less and they form closed packed fcc structure.

At higher temperature, atoms vibration is more so they have more space to move that why they form bcc structure

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