Prelim2Answers - 2(a(10 points Predict the geometry about...

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2. (a) (10 points) Predict the geometry about the central I atom in the IF + 4 ion. (b) (10 points) Consider the anion nitroamide, HNNO 2 . Draw Lewis structures which you expect to contribute significantly to the properties of the anion, assess formal charges and suggest which of your structures should be considered the most relevant. 3
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5 While for HF we said the energy levels of the MO’s were determined exclusively by the AO’s of the F, as they were so much lower, the situation is less clear for two atoms more nearly alike; this appears to be the correct ordering of MO’s for the BO molecule. It would like almost exactly the same—except that all the AO’s would be of identical energy, left and right.
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(c) (5 points) O 2 is paramagnetic–a result not predicted from its Lewis structure, but instead obvious from its MO diagram. Identify the highest energy occupied molecular orbital(s) for O 2 , state their occupancy, and sketch both the atomic orbitals which come together to form the highest energy MO’s and the shape of the molecular orbital(s).
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