H03- Atomic Theory 2-solutions

H03- Atomic Theory 2-solutions - gonzales(pag757 H03 Atomic...

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gonzales (pag757) – H03: Atomic Theory 2 – McCord – (53130) 1 This print-out should have 22 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 6 p ? 1. 4 2. 5 3. 2 4. None oF these 5. 6 correct 6. 3 Explanation: n = 6 002 (part 2 oF 3) 10.0 points What is the orbital angular momentum quan- tum number For the orbital 6 p ? 1. None oF these 2. 3 3. 2 4. 1 correct 5. 0 6. 4 Explanation: = 1 003 (part 3 oF 3) 10.0 points How many magnetic quantum numbers does the orbital 6 p have? 1. None oF these 2. 5 3. 1 4. 3 correct 5. 9 6. 7 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. 3 3. 20 4. 16 5. 8 correct 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. 0 and 2 2. 0 and 1 3. 2 and 1 4. 1 and 1 5. 2 and 2 correct
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gonzales (pag757) – H03: Atomic Theory 2 – McCord – (53130) 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. s subshells.
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H03- Atomic Theory 2-solutions - gonzales(pag757 H03 Atomic...

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