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Magazine Problem 74
Substance \(\mathrm{B}\) is hard, does not conduct electricity, and melts at at \(1200^{\circ} \mathrm{C} .\) Substance \(\mathrm{B}\) is likely a(n): (a) ionic solid (b) metallic solid (c) molecular solid (d) covalent network solid
Problem 75
Describe the crystal structure of iron, which crystallizes with two equivalent metal atoms in a cubic unit cell.
Problem 76
Describe the crystal structure of \(\mathrm{Pt}\), which crystallizes with four equivalent metal atoms in a cubic unit cell.
Problem 77
What is the coordination number of a chrominm atom in the hody-centered cubic structure of chrominm?
Problem 78
What is the coordination number of an aluminum atom in the face-centered cubic structure of aluminum?
Problem 79
Cobalt metal crystallizes in a hexagonal closest packed structure. What is the coordination number of a cobalt atom?
Problem 80
Nickel metal crystallizes in a cubic closest packed structure. What is the coordination number of a nickel atom?
Problem 85
The density of aluminum is $$2.7 \mathrm{g} / \mathrm{cm}^{3} ; \text { that of silicon is } 2.3 \mathrm{g} / \mathrm{cm}^{3}$$ Explain why Si has the lower density even though it has heavier atoms.
Problem 87
Cadmium sulfide, sometimes used as a yellow pigment by artists, crystallizes with cadmium, occupying onehalf of the tetrahedral holes in a closest packed array of sulfide ions. What is the formula of cadmium sulfide? Explain your answer.
Problem 90
A compound containing zinc, aluminum, and sulfur crystallizes with a closest- packed array of sulfide ions. Zinc ions are found in one-eighth of the tetrahedral holes and aluminum ions in one-half of the octahedral holes. What is the empirical formula of the compound?
