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chapt09_lec - Chapter 9 Models of Chemical Bonding 9-1 Dr...

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9-1 Dr. Wolf’s CHM 101 Chapter 9 Models of Chemical Bonding
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9-2 Dr. Wolf’s CHM 101 Models of Chemical Bonding 9.1 Atomic Properties and Chemical Bonds 9.2 The Ionic Bonding Model 9.3 The Covalent Bonding Model 9.4 Between the Extremes: Electronegativity and Bond Polarity 9.5 An Introduction to Metallic Bonding
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9-3 Dr. Wolf’s CHM 101 A general comparison of metals and nonmetals
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9-4 Dr. Wolf’s CHM 101 Types of Chemical Bonding 1. Metal with nonmetal: electron transfer and ionic bonding 2. Nonmetal with nonmetal: electron sharing and covalent bonding 3. Metal with metal: electron pooling and metallic bonding
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9-5 Dr. Wolf’s CHM 101 The three models of chemical bonding
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9-6 Dr. Wolf’s CHM 101 Lewis Electron-Dot Symbols For main group elements - Example: Nitrogen, N, is in Group 5A and therefore has 5 valence electrons. N : . . . The A group number gives the number of valence electrons. Place one dot per valence electron on each of the four sides of the element symbol. Pair the dots (electrons) until all of the valence electrons are used.
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9-7 Dr. Wolf’s CHM 101 Lewis electron-dot symbols for elements in Periods 2 and 3
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9-8 Dr. Wolf’s CHM 101 Ionic Bonding Ionic bonding results when there is a transfer of electrons between two atoms. Each atom achieves a full outer level of electrons. For many atoms in the 2nd and 3rd period, this would be 8 electrons, known as the octet rule.
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9-9 Dr. Wolf’s CHM 101 SAMPLE PROBLEM 9.1 Depicting Ion Formation PLAN: SOLUTION: PROBLEM: Use partial orbital diagrams and Lewis symbols to depict the formation of Na + and O 2- ions from the atoms, and determine the formula of the compound.
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