# hw3a - Thomas, Phillip Homework 3 Due: Sep 26 2007, 11:00...

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Thomas, 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 – fnd 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. 3 d 2. 4 f 3. 4 d correct 4. 4 s 5. 3 p 6. 4 p , 4 d or 4 f 7. 3 s 8. 3 f 9. 4 p 10. 4 d or 4 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. 2,0,0 2. 2,0,1 3. 3,0,0 4. 2,1,1 5. 3,1,-2 6. 3,1,1 correct 7. 3,2,0 8. 3,2,1 Explanation: The electron confguration 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. 8 2. 24 3. 4 4. 13 correct 5. 2 6. 12 7. 6 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 flled 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?

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Thomas, Phillip – Homework 3 – Due: Sep 26 2007, 11:00 pm – Inst: Brodbelt 2 1. orbital shape
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## This note was uploaded on 06/07/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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hw3a - Thomas, Phillip Homework 3 Due: Sep 26 2007, 11:00...

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