Chapter7-1

Why is this so far off from the value calculated 31

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Unformatted text preview: d? 31 Chem 6A Michael J. Sailor, UC San Diego Solution-Why is the answer so far off from the actual number? Calculate what would be the charge on the nucleus for an Ionization Energy of 495 kJ/mol: Electron only feels an “effective charge” of 1.84 (not 11) because of charge screening by the inner electrons 32 Chem 6A Michael J. Sailor, UC San Diego Sections SECTION D01 D02 D03 D04 D05 D06 D07 D08 D09 TIME M 1-1:50 pm2-2:50 M pm3-3:50 M pm 6-6:50 Tu pm 7-7:50 Tu pm8-8:50 W am9-9:50 W am 5-5:50 Th pm 6-6:50 Th pm Chem 6A Michael J. Sailor, UC San Diego LOCATIO N WLH 2114 WLH 2114 WLH 2114 Solis 110 Solis 110 WLH 2114 WLH 2114 HSS 1128A HSS 1128A 33 Mon, Oct 25 • Quiz 6 on Friday Oct 29 covers material through Fri Oct 22 lecture, and problem 7.35 in the homework 34 Chem 6A Michael J. Sailor, UC San Diego Number of students Grade Projection Quiz, 1, 2, 3 Chem 6A Michael J. Sailor, UC San Diego 36 Chem 6A Michael J. Sailor, UC San Diego Number of students Grade Projection Quizzes 1-5 Chem 6A Michael J. Sailor, UC San Diego Advice on studying (1) Read the chapters (2) Do the homework (3) Do related homework problems (in the book or in the online ARIS resource) (4) Be sure you understand how to do all the example problems worked out in class (5) Visit helproom, section, or my office hours to answer questions or problems you can’t solve 38 Chem 6A Michael J. Sailor, UC San Diego Failures of the Bohr model of the atom (1) Bohr model only works for hydrogen. It fails to predict any other element's gas phase spectrum. (2) Classical physics predicts that a charged particle undergoing acceleration radiates light. Electrons couldn't stay in fixed orbits (angular acceleration) according to classical physics. 39 Chem 6A Michael J. Sailor, UC San Diego Quantum mechanics mid 1920's: DeBroglie: an electron can be described as a wave Heisenberg, Schroedinger: used standing waves instead of orbits to describe electrons around atoms. Key features of quantum mechanics: (1) Electrons a...
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This note was uploaded on 08/31/2011 for the course CHEM 6A taught by Professor Pomeroy during the Winter '08 term at UCSD.

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