hw 2 - Garg, Pallavi – Homework 2 – Due: Oct 2 2007,...

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Unformatted text preview: Garg, Pallavi – Homework 2 – Due: Oct 2 2007, 11:00 pm – Inst: Donna C Lyon 1 This print-out should have 69 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This HW assignment is due Tuesday, Oc- tober 3 by 11:00PM. DO NOT WAIT UN- TIL THE LAST HOUR TO TURN IN YOUR HOMEWORK ANSWERS. KEEP UP WITH THE MATERIAL BY ANSWER- ING QUESTIONS AS THEY ARE COV- ERED IN CLASS. 001 (part 1 of 1) 10 points Which of the following is the valence elec- tronic structure for a halogen? 1. n s 2 n p 6 2. n s 2 n d 10 3. n s 1 4. n s 2 n p 5 correct 5. n s 2 Explanation: Halogens are Group VIIA elements and have 7 valence electrons. This corresponds to a valence electronic structure of n s 2 n p 5 . 002 (part 1 of 1) 10 points Which of these elements, as a neutral atom, would have an electronic configuration influ- enced by the increased stability of a filled or half-filled subshell? 1. Cr and Cu correct 2. Zn and Cr 3. Zn only 4. Cr only 5. Cu only Explanation: Cr and Cu are exceptions to the rules for filling orbitals. The electron intended to fill the 4 s orbital is added to the 3 d orbital in- stead. Half-filling the Cr 3 d orbital and fully filling the Cu 3 d orbital is much more energet- ically stable for the electron than filling the 4 s orbital. 003 (part 1 of 1) 10 points The maximum number of electrons allowed in a p sublevel of the 3 rd principal level is 1. 3. 2. 1. 3. 8. 4. 2. 5. 6. correct Explanation: The maximum number of electrons for any p sublevel is 6. 004 (part 1 of 1) 10 points The number of electrons in the outermost principal energy level of a chlorine atom is 1. 5. 2. 6. 3. 4. 4. 7. correct Explanation: Cl has 7 valence e- . 005 (part 1 of 1) 10 points A neutral atom has a ground state electronic configuration designated 1 s 2 2 s 2 2 p 2 . Which of the following statements concerning this atom is/are true? 1. The element has atomic number 6. 2. The atom has 2 unpaired electrons. Garg, Pallavi – Homework 2 – Due: Oct 2 2007, 11:00 pm – Inst: Donna C Lyon 2 3. The atom has electrons in four different orbitals. 4. All are true. correct 5. The atom contains 6 protons. Explanation: 006 (part 1 of 1) 10 points The electron configuration for the Mn atom is 1. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 4 p 5 . 2. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 5 . correct 3. 1 s 2 2 s 2 2 s 6 3 s 6 3 d 7 . 4. 1 s 2 2 s 2 2 p 6 2 d 10 3 s 2 3 p 3 . 5. None of these Explanation: 007 (part 1 of 1) 10 points A neutral isolated atom has a ground state configuration of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 3 . Identify the element. 1. The question cannot be answered unless the atomic weight is known....
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This note was uploaded on 09/17/2009 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.

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hw 2 - Garg, Pallavi – Homework 2 – Due: Oct 2 2007,...

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