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Unformatted text preview: marquez (ecm739) – H03: Atomic Theory 2 – McCord – (53110) 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 6 f ? 1. 3 2. None of these 3. 2 4. 6 correct 5. 5 6. 4 Explanation: n = 6 002 (part 2 of 3) 10.0 points What is the orbital angular momentum quan tum number for the orbital 6 f ? 1. 1 2. 3 correct 3. 2 4. 4 5. 6. None of these Explanation: ℓ = 3 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 6 f have? 1. None of these 2. 7 correct 3. 1 4. 5 5. 3 6. 9 Explanation: m ℓ = 3 , 2 , 1 , , 1 , 2 , 3 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 16 2. 3 3. 20 4. 5 5. 8 correct 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. 0 and 1 2. 0 and 2 3. 2 and 2 correct 4. 2 and 1 5. 1 and 1 marquez (ecm739) – H03: Atomic Theory 2 – McCord – (53110) 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....
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 Spring '07
 Holcombe
 Atom, Atomic orbital, Marquez, n+ n+ n+

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