hw3 - Gu, Phillip – Homework 3 – Due: Sep 26 2007,...

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Unformatted text preview: Gu, Phillip – Homework 3 – Due: Sep 26 2007, 11:00 pm – Inst: Brodbelt 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Brodbelt CH301 Homework 3 Chapter 12 Due September 26 at 11:00 pm 001 (part 1 of 1) 10 points What type of orbital is represented by: principal ( n ) = 4, subsidiary ( ‘ ) = 2, magnetic =- 2, spin =- 1 2 ? 1. 4 d correct 2. 4 s 3. 4 d or 4 f 4. 3 p 5. 4 f 6. 4 p 7. 3 s 8. 3 d 9. 4 p , 4 d or 4 f 10. 3 f Explanation: The orbital is dictated by the subsidiary quantum number. The principal quantum number tells us in which energy level the or- bital is located. ‘ = 2 tells us this is a d- orbital, while n = 2 tells us it is in the fourth principal level. 4 d is the correct answer. 002 (part 1 of 1) 10 points What is a set of correct quantum numbers ( n , ‘ , m l ) for the last electron of P- ? 1. 3,2,1 2. 3,1,-2 3. 2,0,0 4. 3,0,0 5. 2,1,1 6. 3,2,0 7. 2,0,1 8. 3,1,1 correct Explanation: The electron configuration of P- is [Ne] 3s 2 3p 4 . The principal quantum number ( n ) is 3. The angular momentum quantum number ‘ is 1 for the p orbital and m l can be 1, 0, -1. 003 (part 1 of 1) 10 points How many electrons are in the third principal level ( n = 3) of a chromium (Cr) atom? 1. 6 2. 24 3. 13 correct 4. 2 5. 12 6. 4 7. 8 Explanation: There are 2 electrons in the 3 s orbital, 6 electrons in the 3 p orbitals and 5 electrons in the 3 d orbitals. Remember that Cr is an exception. One electron from the 4 s orbital gets elevated to a 3 d orbital giving it a half filled 3 d orbital. 004 (part 1 of 1) 10 points The principal quantum number provides us with information about what characteristic of an electron bound in an atom? Gu, Phillip – Homework 3 – Due: Sep 26 2007, 11:00 pm – Inst: Brodbelt 2 1. spin 2. mass...
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This note was uploaded on 03/19/2009 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.

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hw3 - Gu, Phillip – Homework 3 – Due: Sep 26 2007,...

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