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ENGR 220 Ch02_ppt_Callister8e_RK Part 3

# ENGR 220 Ch02_ppt_Callister8e_RK Part 3 - ANNOUNCEMENTS 1...

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9/26/11 1 Chapter 2 - 4 5 ± If you Missed Week 1: Check BbVista page for Course Intro. lecture (Logistics of course + Ch. 1) Syllabus download, read Bonding in Solids handout Recitation section & schedule information, etc. ANNOUNCEMENTS - 1 Chapter 2 - 4 6 ± Reading: Chapter 2, and Bonding in Solids ” handout (download from BbVista & read) ± Recitations: Week 2 Recitation Problems: #s: 2.8, 2.11, 2.13, 2.17, 2.18, 2.21, 2.22 Solutions to Problem #’s 2.14 and 2.20 should be prepared and handed in during Week 3 Recitation and will count as Quiz 1 ANNOUNCEMENTS - 2

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9/26/11 2 Chapter 2 - 4 7 ANNOUNCEMENTS - 3 ± Week 2 Recitations: Convocation, Tuesday 9/27/11 Classes canceled 10 am to 1 pm Only potentially affects Recitation Sections 001 (Justin Griggs) and 004 (Maria Torres) Both Recitation sections will run as scheduled Chapter 2 - 4 8 Let’s Make Na Metal Start with 6x10 23 atoms of Na Q. How many grams is that? A. 22.99 g Strip them of valence electrons Q. How many electrons is that? A. 6 x 10 23 Place the ions in a box Q. Is that stable?? What is value of Z? 1 Add the electrons Q. Is that physically stable?? A. Yes very stable +Z +Z +Z +Z +Z +Z +Z +Z +Z
9/26/11 3 Chapter 2 - 4 9 Electrostatic Model of Metallic Bonding Metallic Atoms: 1, 2 or 3 valence e

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ENGR 220 Ch02_ppt_Callister8e_RK Part 3 - ANNOUNCEMENTS 1...

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