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Unformatted text preview: Chem 125 Exam #3 Fall 2010 PART A. (4 Points each) 1. For which orbital does the drawing represent the electron density (electron cloud)? Careful, consider the number of radial notes. a. A 1s orbital. c. A 2p oribital. e. A 3d orbital. b. A 2s orbital. d. A 3p orbital. 2. Which set of quantum mechanical numbers is CORRECT for an electron? a. n =2, l = 2, m l =1, m s =1. b. n =2, l = 2, m l =2, m s = 1/2. c. n =3, l = 2, m l =1, m s = 1/2. d n =2, l = 1, m l =1, m s = 1/2. e. n =2, l = 0, m l =1, m s = 1/2. 3. Which of the following is the correct ground state electron configuration for sulfur 2 , S 2 ? a. [Ne] 3s 2 3p 6 b. [Ne] 3s 2 3p 2 c. [Ne] 3s 2 3d 6 d. [Ne] 3s 2 3p 4 3d 2 e. [Ne] 3s 2 3p 5 4. If Mn 1+ existed, how many unpaired electrons would it have and is it diamagnetic or paramagnetic? a. 6 unpaired electrons; paramagnetic. b. 6 unpaired electrons; diamagnetic. c. 4 unpaired electrons; paramagnetic. d. 4 unpaired electrons; diamagnetic. e. None of the above is correct. 5. Which is the correct ground state electron configuration for molybdenum, Mo? Careful. a. [Kr] 5s ↑↓ 4d ↑↓ ↑↓ b. [Kr] 5s ↑↓ 4d ↑ ↑ ↑ ↑ c. [Kr] 5s ↑ 4d ↑ ↑ ↑ ↑ ↑ d. [Kr] 5s ↑↓ 4d ↑ ↑ ↓ ↑ ↑ e. [Kr] 5s ↑ 4d ↑↓ ↑↓ ↑ 6. An exited electron in a hyd Which change emits a pho a. n = 5 to n = 3 b. n = 7 to n = 5 c. n = 12 to n = 10 d. n = 15 to n = 13 e. n = 27 to n = 25 7. Which of the following rea...
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This note was uploaded on 02/04/2011 for the course CHEM 125 taught by Professor Ellis during the Spring '07 term at NJIT.
 Spring '07
 ellis
 Electron, Electron Cloud, pH

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