CHEM171_F08_homework_1key

CHEM171_F08_homework_1key - (11 possible values) l=4 thus m...

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CHEM171 Fall 2008 Solution Key for Homework 1 Question 1 Students are responsible for exceptions due to ½ and fully filled shell stability. Cr [Ar]3d 5 4s 1 Cu [Ar]3d 10 4s 1 Mo [Kr]4d 5 5s 1 Pd [Kr]4d 10 Ag [Kr]4d 10 5s 1 Au [Xe]4f 14 5d 10 6s 1 Question 2 A Æ excited B Æ forbidden C Æ ground D Æ excited E Æ excited F Æ forbidden Question 3 a) [He]2 s 2 2 p 4 multiplicity: 3 b) [He]2 2 2 3 multiplicity: 4 c) [Kr]5 2 4 d 10 5 6 multiplicity: 1 d) [Ar]3 6 multiplicity: 5 e) [Xe]4 f 14 5 8 multiplicity: 3 Question 4 Carbon: 1s 2 2s 2 2p x 1 2p y 1 (2 unpaired electrons) Chlorine: 1s 2 2s 2 2p 6 3s 2 3p x 2 3p y 2 3p z 1 (1 unpaired electrons) Argon: 1s 2 2s 2 2p 6 3s 2 3p 6 (0 unpaired electrons)
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Question 5 The y-axis = 4 π r 2 Ψ 2 and the 4f orbital (l = 3) radial distribution function, for a hydrogen- like atom, resembles that of 3d, 2p and 1s except a maximum probability density occurs further from the nucleus in 4f than in 3d. Question 6 For n =6, l=5 thus m l = 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5
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Unformatted text preview: (11 possible values) l=4 thus m l = 4, 3, 2, 1, 0, -1, -2, -3, -4, (9 possible values) l=3 thus m l = 3, 2, 1, 0, -1, -2, -3 (7 possible values) l=2 thus m l = 2, 1, 0, -1, -2 (5 possible values) l=1 thus m l = 1, 0, -1 (3 possible values) l=0 thus m l = 0 (1 possible value) For each set of quantum numbers m s = +1/2 or -1/2 therefore a total of 72 combinations are possible for l, m l , m s given n=6 Question 7 Ca Æ [Ar]4s 2 Mg 2+ Æ [Ne] or 1s 2 2s 2 2p 6 Question 8 In the hydrogen atom (Z = 1) there are no effects from shielding or electron-electron repulsion as in many electron atoms. Bonus For this particular key the lowest value of n =3, but if you started with n=2 then it’s also correct. Given the following set of rules: Noble Gases Æ 2, 6, 12, 20 Halogens Æ 5, 11, 19...
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This note was uploaded on 01/29/2010 for the course CHEM 142725201 taught by Professor Kaner during the Fall '08 term at UCLA.

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CHEM171_F08_homework_1key - (11 possible values) l=4 thus m...

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