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H04- Atomic Theory 2-solutions

H04- Atomic Theory 2-solutions - truitt(wtt255 H04 Atomic...

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truitt (wtt255) – 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 p ? 1. 6 2. 5 correct 3. 2 4. 4 5. None of these 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 p ? 1. 2 2. 3 3. 1 correct 4. 4 5. None of these 6. 0 Explanation: = 1 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 5 p have? 1. 5 2. None of these 3. 9 4. 7 5. 1 6. 3 correct Explanation: m = - 1 , 0 , 1 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 10 2. 8 correct 3. 3 4. 20 5. 16 6. 5 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 2 correct 2. 0 and 1 3. 0 and 2 4. 1 and 1 5. 2 and 1
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truitt (wtt255) – 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. s subshells. 2. d subshells. correct 3. p subshells. 4. f 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. 4 d 2. 3 s 3. 3 d correct 4. 4 s 5. 4 p 6. 3 p 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 [Kr] 4 d 10 5 s 2 5 p 5 ? 1. tellurium 2. xenon 3. lutetium 4. tin 5. cadmium 6. barium 7. antimony 8. iodine correct 9. indium 10. cesium 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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