Chapter 12 Notes - Chapter 12- Chemical Bonding A....

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Chapter 12- Chemical Bonding A. Introduction 1. Review a. Energy Levels c. Octet Rule- Isoelectronic Ions 2. Periodic Table predicts the electron dot symbol. (or # of valence electrons) 3. Chemical Bonds: a. The electron arrangement in the valence shell determines if the atom will form chemical bonds. (Atoms want octet of electrons) b. A chemical bond involves a transfer or a shift of outer-shell electrons in the bonded atoms.
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c. When chemical bonds form, energy is released. Energy must be absorbed to break chemical bonds. B. Ionic Bonds-"Give and Take" 1. Def.- Attraction between cations and anions formed when electrons transfer from metallic to nonmetallic atom. 2. Energy Changes (Ionization energy vs. electron affinity) 3. Crystal Structures 4. Examples: FeCl_3, MgO, Fe_2O_3, AlI_3 5. Properties of Ionic Solids a. Solids at room temperature b. Most have high melting points c. Solids are poor electrical conductors
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d. Molten (liquid) ionic compounds and water solutions
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Chapter 12 Notes - Chapter 12- Chemical Bonding A....

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