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Unformatted text preview: saldana (avs387) – H03: Atomic Theory 2 – Mccord – (52385) 1 This printout should have 22 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. Here are more questions from Chapter 12. You should really work far more problems than are here. Work problems that are at the end of Chapter 12  there are over 100 there and you can check the answers on half of them (the oddnumbered ones). Also, a reminder that our first exam is on Wednesday, 2/10, from 79 PM in WEL 2.122. 001 (part 1 of 3) 10.0 points What is the principal quantum number for the orbital 5 p ? 1. None of these 2. 6 3. 4 4. 2 5. 3 6. 5 correct 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. None of these 2. 1 correct 3. 2 4. 4 5. 3 6. Explanation: ℓ = 1 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 5 p have? 1. 1 2. 3 correct 3. 7 4. 5 5. 9 6. None of these Explanation: 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 5 2. 3 3. 16 4. 20 5. 10 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. 0 and 1 saldana (avs387) – H03: Atomic Theory 2 – Mccord – (52385) 2 2. 2 and 1 3. 0 and 2 4. 1 and 1 5. 2 and 2 correct 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.orbital has two nodes....
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 Spring '07
 Holcombe
 Atom, Atomic orbital, Saldaña, n+ n+ n+

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