MASC Solution to Midterm I Fall 2008

MASC Solution to Midterm I Fall 2008 - kJ/mole The ionic...

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University of Southern California MASC 110L Midterm I E. Goo September 26, 2008 Answer all questions. All questions are of equal value. Must show your work neatly to get full credit. 1. Give the electronic configuration for the following atoms or ions: a) Si 1s 2 2s 2 2p 6 3s 2 3p 2 Or [Ne] 3s 2 3p 2 b) O 1s 2 2s 2 2p 4 Or [He] 2s 2 2p 4 c) Na + 1s 2 2s 2 2p 6 Or [Ne] d) Cl - 1s 2 2s 2 2p 6 3s 2 3p 6 Or [Ar] e) Ti 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 4s 2 is okay Or [Ar]4s 2 3d 2
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2. Give the steric number of the center atom and predict the shape of the following molecules a) CH 4 SN = 4 tetrahedral b) XeF 2 SN = 5 linear c) PCl 3 SN = 4 trigonal pyramidal , trigonal pyramid okay d) XeF 4 SN = 6 square, square planar okay e) PCl 5 SN = 5 trigonal bipyramidal, trigonal bipyramid okay
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