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Unformatted text preview: solis (nrs545) – H03: Atomic Theory 2 – McCord – (53130) 1 This printout should have 22 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 3 d ? 1. 5 2. 6 3. 2 4. None of these 5. 3 correct 6. 4 Explanation: n = 3 002 (part 2 of 3) 10.0 points What is the orbital angular momentum quan tum number for the orbital 3 d ? 1. 3 2. 2 correct 3. 1 4. None of these 5. 4 6. Explanation: ℓ = 2 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 3 d have? 1. 9 2. 5 correct 3. None of these 4. 1 5. 3 6. 7 Explanation: m ℓ = 2 , 1 , , 1 , 2 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 10 2. 5 3. 3 4. 20 5. 16 6. 8 correct 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 1 5. 0 and 2 solis (nrs545) – H03: Atomic Theory 2 – McCord – (53130) 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. s subshells....
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This note was uploaded on 09/24/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.
 Spring '07
 Fakhreddine/Lyon
 Chemistry, Atom

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