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Unformatted text preview: segal (mas6582) – 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 3 d ? 1. 4 2. None of these 3. 3 correct 4. 6 5. 5 6. 2 Explanation: n = 3 002 (part 2 of 3) 10.0 points What is the orbital angular momentum quan tum number for the orbital 3 d ? 1. 1 2. 3. 3 4. None of these 5. 4 6. 2 correct Explanation: ℓ = 2 003 (part 3 of 3) 10.0 points How many magnetic quantum numbers does the orbital 3 d have? 1. 5 correct 2. 9 3. None of these 4. 3 5. 7 6. 1 Explanation: m ℓ = 2 , 1 , , 1 , 2 004 10.0 points How many total nodal planes are present in the complete set of 3 d orbitals? 1. 20 2. 10 3. 8 correct 4. 3 5. 5 6. 16 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. 2 and 1 4. 1 and 1 5. 2 and 2 correct segal (mas6582) – 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. d subshells. correct 2. s subshells. 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. 3 p 2. 3 d correct 3. 4 d 4. 4 s 5. 4 p 6. 3 s 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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 Fall '08
 wandelt
 Chemistry, Atom, Periodic Table, Atomic orbital

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