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H04- Atomic Theory 2-solutions

H04- Atomic Theory 2-solutions - patel(ap28872 H04 Atomic...

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patel (ap28872) – H04: Atomic Theory 2 – mccord – (51600) 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(part1of3)10.0points What is the principal quantum number for the orbital 5 p ? 1. 3 2. 4 3. 6 4. 5 correct 5. 2 6. None of these Explanation: n = 5 002(part2of3)10.0points What is the orbital angular momentum quan- tum number for the orbital 5 p ? 1. 1 correct 2. 3 3. None of these 4. 2 5. 4 6. 0 Explanation: = 1 003(part3of3)10.0points How many magnetic quantum numbers does the orbital 5 p have? 1. 7 2. 5 3. 9 4. None of these 5. 1 6. 3 correct Explanation: m = - 1 , 0 , 1 004 10.0points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 3 2. 16 3. 8 correct 4. 10 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 10.0points How many nodes are present in a 3 s and a 3 p orbital, respectively? 1. 2 and 2 correct 2. 0 and 2 3. 1 and 1 4. 0 and 1 5. 2 and 1
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patel (ap28872) – 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 10.0points The transition metals are elements with par- tially filled 1. d subshells. correct 2. p subshells. 3. f subshells. 4. s subshells. Explanation: In transition metals, d orbitals are being filled. 007 10.0points An element with 20 protons and 20 electrons gains one electron. The electron goes into what type of orbital? 1. 4 d 2. 3 s 3. 4 s 4. 3 p 5. 4 p 6. 3 d correct 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 10.0points Which element is predicted to have the ground-state electron configuration [Ar] 3 d 3 4 s 2 ? 1. zinc 2. manganese 3. nickel 4. chromium 5. iron 6. copper 7. cobalt 8. germanium 9. titanium 10. vanadium correct 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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