Week 7 Key Practice Problems

Week 7 Key Practice Problems - CHEMISTRY 201X Practice...

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CHEMISTRY 201X October 1-5, 2007 Practice Problems (57) Which of the following combinations of quantum numbers are allowed for an electron in a one-electron atom? Which are not? (a) n = 2, l = 2, m = 1, m s = 1/2 Not allowed: for n = 2, can only have l = 0, 1. (b) n = 3, l = 1, m = 0, m s = 1/2 Allowed (c) n = 5, l = 1, m = 2, m s = 1/2 Not allowed: for l = 1, can only have m = +1, 0 or 1. (d) n = 4, l = 1, m = 0, m s = 1/2 Not allowed: cannot have negative l numbers. (e) n = 3, l = 2, m = 1, m s = 0 Not allowed: m s = +1/2 or 1/2 only, not 0. (f) n = 2, l = 0, m = 1, m s = 1/2 Not allowed: for l = 0, can only have m = 0. (g) n = 7, l = 2, m = 2, m s = 1/2 Allowed. (h) n = 3, l = 3, m = 0, m s = 1/2 Not allowed: cannot have negative l numbers. (58) Write down the ground state electronic configurations for (a) Elements: C, Se, Fe, P, Tc, Ho; C: [He](2 s ) 2 (2 p ) 2 2 unpaired electrons Se: [Ar](3 d ) 10 (4 s ) 2 (4 p ) 4 2 unpaired electrons Fe: [Ar](4 s
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Week 7 Key Practice Problems - CHEMISTRY 201X Practice...

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