171_hw3_2008 - 7 Figure 1 shows a molecule of tetrahedral...

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CHEMISTRY 171: PROBLEM SET #3 (10/10/08) Due: FRIDAY October 17, 2008 1. Briefly define the following terms: a) symmetry element, b) symmetry operation and c) point group. 2. What is the only symmetry element present in ONCl? 3. Draw Lewis structures for the following molecules and predict the molecular geometry including any distortions, also assign point groups: a. BCl 3 b. BeH 2 c. SnBr 4 d. TeF 6 e. AsF 5 f. XeO 4 g. TeCl 4 h. ICl 2 + i. ClF 3 j. SO 2 k. KrF 2 l. XeF 6 m. XeO 3 n. ClO 2 F 3 4. Identify the point groups for the following. Out of all the point groups which one has the highest symmetry? Lowest? 5. What is the only symmetry operation besides E present in trans 1,2-dichlorocyclobutane? 6. Assign point groups to the following 2 molecules:
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Unformatted text preview: 7. Figure 1 shows a molecule of tetrahedral symmetry (point group T d ) inside a tetrahedron. Please use the letters in the atoms (vertices) to describe all mirror planes of symmetry d Figure 1 8. Determine the point group for all possible conformations of dinitrogen tetrafluoride, F 2 NNF 2 . Is F 2 NNF 2 a chiral molecule? Why or why not? 9. When determining the effective nuclear charge for a 1s electron Slaters rules dictate that the other 1s electron must have a value of 0.30 not 0.35. Why? What element are we talking about? BONUS: How many different point groups are there for s, p, d and f orbitals?...
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