Вопрос
51. The radius of gold is 144 pm , and the density is 19.32g/cm^3 Does elemental gold have a face -centered cubic : structure or a body-centered cubic structure? 52. The radius of tungsten is 137 pm and the density is 19.3g/cm^3 Does elemental I tungsten have a face-centered I cubic structure or a body-centered I cubic structure?
Решения
4.3
(143 Голоса)
Галия
элита · Репетитор 8 лет
Ответ
51. The correct answer is: face-centered cubic structure.Explanation: The radius of gold is 144 pm, which is relatively large compared to the radius of tungsten (137 pm). In a face-centered cubic (FCC) structure, the atoms are located at the corners and the centers of each face of the cube. This structure allows for a more efficient packing of atoms, which is suitable for metals with larger atomic radii like gold. The density of gold is also consistent with the FCC structure, as it allows for a higher packing efficiency and a higher density.52. The correct answer is: body-centered cubic structure.Explanation: The radius of tungsten is 137 pm, which is relatively small compared to the radius of gold (144 pm). In a body-centered cubic (BCC) structure, the atoms are located at the corners and a single atom in the center of the cube. This structure is more suitable for metals with smaller atomic radii like tungsten. The density of tungsten is also consistent with the BCC structure, as it allows for a lower packing efficiency and a lower density.