HW 4 - johnson(mjj622 H04 Atomic Theory 2 Mccord(50970 This...

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johnson (mjj622) – 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 – fnd all choices beFore answering. 001 (part 1 oF 3) 10.0 points What is the principal quantum number For the orbital 4 d ? 1. None oF these 2. 5 3. 2 4. 6 5. 3 6. 4 correct Explanation: n = 4 002 (part 2 oF 3) 10.0 points What is the orbital angular momentum quan- tum number For the orbital 4 d ? 1. 4 2. None oF these 3. 2 correct 4. 3 5. 0 6. 1 Explanation: = 2 003 (part 3 oF 3) 10.0 points How many magnetic quantum numbers does the orbital 4 d have? 1. 5 correct 2. None oF these 3. 3 4. 7 5. 9 6. 1 Explanation: m = - 2 , - 1 , 0 , 1 , 2 004 10.0 points How many total nodal planes are present in the complete set oF 3 d orbitals? 1. 8 correct 2. 10 3. 5 4. 16 5. 3 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. 1 and 1 2. 2 and 1 3. 0 and 2 4. 0 and 1 5. 2 and 2 correct
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johnson (mjj622) – 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 Flled 1. d subshells. correct 2. s subshells. 3. f subshells. 4. p 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. 3 s 2. 3 p 3. 4 p 4. 4 d 5. 4 s 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 [Ne] 3 s 2 3 p 4 ? 1.
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This note was uploaded on 02/10/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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HW 4 - johnson(mjj622 H04 Atomic Theory 2 Mccord(50970 This...

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