PS9 - descend the periodic table (consider the 3-6 periods)...

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1 Chemistry 2090 Problem Set #9 Due Monday (in class), April 4, 2011 Chap 8 Problems: 84, 86, 88 Chap 9 Problems: 14, 18, 24, 28, 29, 36, 38, 44, 46, 60 Ex2. Electron Affinities (EA's) for the groups 13-18 elements are below (KJ/mol): 13 KJ/mol 14 KJ/mol 15 KJ/mol 16 KJ/mol 17 KJ/mol 18 KJ/mol B -27 C -122 N 7 O -141 F -328 Ne >0 Al -43 Si -137 P -72 S -200 Cl -349 Ar >0 Ga -29 Ge -120 As -78 Se -195 Br -325 Kr >0 In -29 Sn -107 Sb -103 Te -190 I -295 Xe >0 Tl -19 Pb -35 Bi -91 Po -186 At -270 Rn >0 a. What is the general trend in EAs as you
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Unformatted text preview: descend the periodic table (consider the 3-6 periods) and why does it exist? b. Despite the general trend in a., the EAs of the 2 nd and 3 rd row are in contrast. Rationalize this discrepancy. c. What is the general trend in EAs across the periodic table (groups 13-17) and why does it exist? d. For most rows, there is a deviation in the general trend in c. What is the deviation? Explain it using electron configurations in your argument. e. Why do the Noble gases have positive electron affinities? f. What is Z eff for Se anion (i.e., Se-)?...
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