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171_hw4_2008 - Helpful structural hints Solid Ar adopts the...

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CHEMISTRY 171: PROBLEM SET #4 (10/17/08) Due: MONDAY, Friday 24, 2008 1. Write the MO electron configuration for the NO - ion. a. What is the bond order? b. Will the bond length be shorter or longer than in NO? c. How many unpaired electrons will be present? d. Will the unpaired electrons be concentrated more on the N or the O? Explain. 2. Consider the hypothetical dioxygen superoxide O 2 + O 2 - . If this compound did exist, what would be the electronic structure of the ions? Discuss bond orders, bond lengths, and unpaired electrons. 3. Describe the unit cell for copper, magnesium and iron. (Hint: Each is different .) How many atoms are in each unit cell? 4. Calculate the densities of the solid forms of Pt, W, and Ar given that the length of their unit cell edges are 3.91Å, 3.165Å and 5.3Å, respectively.
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Unformatted text preview: Helpful structural hints: Solid Ar adopts the FCC structure; Pt is very malleable and ductile; W is brittle. 5. Describe the unit cell for cesium chloride, cubic zinc sulfide and antifluorite (Na 2 O). How many atoms of each type are in each unit cell? 6. a. Describe the packing arrangement of silicon in the unit cell pictured above. b. How many atoms are in the unit cell of Si? c. Given that the density of Si is 2.3 g/cm 3 , calculate the length of the unit cell edge. d. Calculate the Si-Si bond distance. BONUS : What structure does an FCC anionic lattice describe with cations in: a. all Td sites b. 1/2 Td sites c. all Oh sites d. 1/2 Oh sites (is this possible?)...
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