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Unformatted text preview: neutzler (cln558) – H04: Atomic Theory 2 – Mccord – (50970) 1 This printout should have 30 questions. Multiplechoice 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 2 p ? 1. 6 2. None of these 3. 4 4. 3 5. 5 6. 2 correct Explanation: n = 2 002 (part 2 of 3) 10.0 points What is the orbital angular momentum quan tum number for the orbital 2 p ? 1. None of these 2. 3 3. 4 4. 2 5. 1 correct 6. Explanation: ℓ = 1 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 2 p have? 1. 5 2. 7 3. 1 4. 9 5. 3 correct 6. None of these Explanation: m ℓ = 1 , , 1 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 20 2. 3 3. 8 correct 4. 16 5. 10 6. 5 Explanation: There are 5 orbitals in the 3 d set. 4 of those orbitals are cloverleafshaped 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. 0 and 2 2. 0 and 1 3. 1 and 1 4. 2 and 1 5. 2 and 2 correct neutzler (cln558) – 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. p subshells. 2. s subshells. 3. f subshells. 4. d subshells. correct 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. 4 s 4. 3 p 5. 3 d correct 6. 4 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 groundstate electron configuration [He] 2 s 2 2 p 2 ?...
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This note was uploaded on 10/23/2010 for the course CH 50970 taught by Professor Dr.mccord during the Fall '10 term at University of Texas.
 Fall '10
 Dr.McCord

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