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key_e2_f06 - CHE 131 Exam 2 Fall 2006 Multiple Choice 4...

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CHE 131 Exam 2, Fall 2006 Multiple Choice , 4 points each Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following is the molecular orbital electron configuration for O 2 2– ? A. ( σ ls ) 2 ( σ ls *) 2 ( σ 2s ) 2 ( σ 2s *) 2 ( π 2p ) 6 B. ( σ ls ) 2 ( σ ls *) 2 ( σ 2s ) 2 ( σ 2s *) 2 ( π 2p ) 4 ( σ 2p ) 2 C. ( σ ls ) 2 ( σ ls *) 2 ( σ 2s ) 2 ( σ 2s *) 2 ( σ 2p ) 2 ( π 2p ) 6 D. ( σ ls ) 2 ( σ ls *) 2 ( σ 2s ) 2 ( σ 2s *) 2 ( σ 2p ) 2 ( π 2p ) 6 ( π 2p *) 2 E. ( σ ls ) 2 ( σ ls *) 2 ( σ 2s ) 2 ( σ 2s *) 2 ( σ 2p ) 2 ( π 2p ) 4 ( π 2p *) 4 2. The bond lengths of the diatomic molecules Cl 2 , HCl, and HI are, respectively, 200, 127, and 161 pm. What is the radius of an iodine atom? 3. Which, if any, of the following periodic properties are ordered incorrectly ? 4. How many sigma and pi bonds are in the following molecule?
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