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Unformatted text preview: phan (dtp377) H04: Atomic Theory 2 mccord (51600) 1 This printout should have 30 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points What is the principal quantum number for the orbital 5 p ? 1. 6 2. 2 3. 4 4. None of these 5. 5 correct 6. 3 Explanation: n = 5 002 (part 2 of 3) 10.0 points What is the orbital angular momentum quan tum number for the orbital 5 p ? 1. 4 2. 1 correct 3. 2 4. 3 5. None of these 6. Explanation: = 1 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 5 p have? 1. 3 correct 2. 7 3. 1 4. 5 5. None of these 6. 9 Explanation: m = 1 , , 1 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 16 2. 3 3. 8 correct 4. 5 5. 20 6. 10 Explanation: There are 5 orbitals in the 3 d set. 4 of those orbitals are cloverleafshaped and have 2 nodal planes each. That combines to give 8 total nodal planes for the set. The other (5th) orbital is the d z 2 orbital which has 2 nodal cones, not planes. 005 10.0 points How many nodes are present in a 3 s and a 3 p orbital, respectively? 1. 2 and 1 2. 1 and 1 3. 2 and 2 correct 4. 0 and 2 5. 0 and 1 phan (dtp377) H04: Atomic Theory 2 mccord (51600) 2 Explanation: A node is a point, a plane or a three dimen sional region of space where the sign of the wavefunction changes from positive to nega tive, (or negative to positive) so it equals zero. The lowest energy s orbital is 1 s , and this has no nodes the wavefunction is always posi tive. As we go to the next higher value of n we add a spherical node, so 2 s would have one node, and 3 s two. The lowest energy p or bital is 2 p ; it has one nodal plane which cuts through the nucleus (the two lobes have op posite signs). Again, as we go to the next higher value of n we add a spherical node, so a 3 p orbital has two nodes. 006 10.0 points The transition metals are elements with par tially filled 1. d subshells. correct 2. p subshells. 3. s subshells. 4. f subshells. Explanation: In transition metals, d orbitals are being filled. 007 10.0 points An element with 20 protons and 20 electrons gains one electron. The electron goes into what type of orbital? 1. 3 s 2. 4 p 3. 4 d 4. 3 p 5. 3 d correct 6. 4 s Explanation: This element has electron configuration [Ar] 4 s 2 . The next electron goes into the 3 d orbital according to the Aufbau principle. 008 10.0 points Which element is predicted to have the groundstate electron configuration [He] 2 s 2 ?...
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This note was uploaded on 03/26/2012 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas at Austin.
 Spring '08
 wandelt
 Chemistry, Atom, pH

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