H04- Atomic Theory 2-solutions

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

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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 – fnd all choices beFore answering. 001 (part 1 of 3) 10.0 points 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 (part 2 of 3) 10.0 points 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 (part 3 of 3) 10.0 points 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 10.0 points 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 10.0 points How many nodes are present in a 3 s and a 3 p orbital, respectively? 1. 2 and 2 correct 2. 0 and 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 10.0 points The transition metals are elements with par- tially Flled 1. d subshells. correct 2. p subshells. 3. f subshells. 4. s subshells. Explanation: In transition metals, d orbitals are being Flled. 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. 4 s 4. 3 p 5. 4 p 6. 3 d correct Explanation: This element has electron conFguration [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 conFguration [Ar] 3 d 3 4 s 2 ? 1.
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This note was uploaded on 05/12/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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

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