Quiz 2-solutions - Version 278 – Quiz 2 – laude –...

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Unformatted text preview: Version 278 – Quiz 2 – laude – (50995) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0 points What is the electronic configuration of a Sele- nium atom (Se)? 1. [Kr] 4 s 2 3 d 10 4 p 4 2. [Kr] 4 s 2 4 d 10 4 p 4 3. [Kr] 4 s 2 4 f 14 4 d 10 4 p 4 4. [Ar]4 s 2 4 d 10 4 p 4 5. [Ar]4 s 2 3 d 10 4 p 4 correct Explanation: Se has 34 electrons, 18 of which are ac- counted for by the shorthand notation [Ar], and the remaining 16 of which much first fill the 4 s subshell (2 electrons), the 3 d subshell (10 electrons) and finally the 4 p subshell (the last 4 electrons). 002 5.0 points What is the electronic configuration of a di- valent Cobalt anion (Co 2- )? 1. [Ar]4 s 1 3 d 10 correct 2. [Ar]4 s 2 3 d 5 4 p 3 3. [Ar]4 s 1 4 d 9 4. [Ar]4 s 2 3 d 9 5. [Ne] 4 s 1 4 d 10 Explanation: Co 2- is isoelectronic with Cu, and therefore has the same electronic configuration. “Bor- rowing” a 4...
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This note was uploaded on 06/14/2011 for the course MATH 305G taught by Professor Cathy during the Spring '11 term at University of Texas at Austin.

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Quiz 2-solutions - Version 278 – Quiz 2 – laude –...

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