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Atomic Theory2 HW - moreau(mmm4564 H04 Atomic Theory 2...

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moreau (mmm4564) – H04: Atomic Theory 2 – Mccord – (50970) 1 This print-out should have 30 questions. Multiple-choice 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 f ? 1. 5 correct 2. None of these 3. 4 4. 6 5. 2 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 f ? 1. 1 2. 3 correct 3. None of these 4. 2 5. 4 6. 0 Explanation: = 3 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 5 f have? 1. 5 2. 7 correct 3. 1 4. 3 5. None of these 6. 9 Explanation: m = - 3 , - 2 , - 1 , 0 , 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. 8 correct 3. 10 4. 3 5. 5 6. 20 Explanation: There are 5 orbitals in the 3 d set. 4 of those orbitals are cloverleaf-shaped 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. 2 and 2 correct 3. 1 and 1 4. 0 and 2 5. 0 and 1
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moreau (mmm4564) – H04: Atomic Theory 2 – Mccord – (50970) 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. f subshells. 3. p subshells. 4. s 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 d correct 2. 4 d 3. 4 s 4. 3 p 5. 4 p 6. 3 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 ground-state electron configuration [He] 2 s 2 2 p 2 ? 1. boron 2. helium 3. lithium 4. beryllium 5. nitrogen 6. oxygen 7. neon 8. hydrogen 9. carbon correct 10. fluorine Explanation: Remembering the noble gas shorthand, count all of the superscripts that appear in the electron configuration. This will give the number of electrons which in a neutral atom
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