Exam4Spr06Key

Exam4Spr06Key - General Chemistry I Exam 4 Key 1. (10)...

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General Chemistry I Exam 4 – Key 1. (10) Circle the correct answer for the following multiple choice questions. a) How many unpaired electrons are present for an atom of Te in its ground electronic state? 1) none 2) one 3) two 4) three b) Which of the following men discovered that an electron behaves like a wave as well as like a particle? 1) Bohr 2) de Broglie 3) Heisenberg 4) Schrodinger c) Which of the following men was the first to use quantum mechanics to explain the behavior of the electron in a hydrogen atom? 1) Bohr 2) de Broglie 3) Heisenberg 4) Schrodinger d) Which of the following elements has the lowest value for the electronegativity? 1) Cs 2) Al 3) P 4) N e) Which (one) of the following sets of quantum numbers is allowed for an electron in an atom? n l m l m s OK/No 1) 3 2 -1 OK 2) 3 1 -2 ½ No – Possible m l values go from + l to - l 3) 3 3 -1 ½ No -- l < the value of n 4) 3 2 0 0 No – m s = + ½ or -½ 2. (10) Give electron configurations and orbital diagrams for each of the following atoms. In each case you may begin with the electron configuration of the nearest preceding noble gas. Be sure to show all the electrons that are added after the nearest preceding noble gas. a) Cu 29 [Ar] 4s 1 3d 10 b) Os 76 [Xe] 6s 2 4f 14 5d 6 3. (8) Answer the following questions about atomic orbitals. a) What is the shape of the 1s orbital and of the 2s orbital? How do these orbitals differ? Both are spheres. The 2s orbital is larger than the 1s. b) How many p orbitals are present in a given electron shell? What is the shape of these orbitals and how are they oriented in space with respect to one another? p orbitals are dumbbell shaped. There are 3 p orbitals in each electron shell except the first. One is along the X axis, one along the Y axis, and one along the Z axis. c) What is the value of the quantum number l   (this is a small letter L) for a d orbital? l = 2 for d orbitals
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d) What values are possible for the quantum number m l for a d orbital? when l = 2, m l can be 2, 1, 0, -1, -2. The 5 different values correspond to the 5 different d orbitals possible in a given electron shell. 5. (6) Answer the following questions about electron affinities.
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Exam4Spr06Key - General Chemistry I Exam 4 Key 1. (10)...

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