chapter8 - CHM 25 CHM 25 Spring 2009 2009 Chapter 8...

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CHM 25 pring 009 Spring 2009 Chapter 8 – Chemical Bonding Prof. R.S. Miller
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Examples of Bonding Types
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Ionic Bonds ± Formed from electrostatic attractions of closely packed, oppositely charged ions. ± Formed when an atom that easily loses electrons reacts with one that has a high electron affinity . ± When a nonmetal and a metal react (ionic compound): The valence orbitals of the metal are emptied to achieve oble Gas electron configuration The valence electron Noble Gas electron configuration. The valence electron configuration of the nonmetal gains electrons to achieve Noble Gas electron configuration.
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y ± Electron affinity is the energy change when a gaseous atom gains an electron to form a gaseous ion: Cl + e- Cl - ( g ) ( g ) ± Electron affinity can either be exothermic (as the above ample) or endothermic: example) or endothermic: Ar ( g ) + e- Ar - ( g ) Trends: electron affinity increases (become more positive) as you go down a group and decreases (become more
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This note was uploaded on 02/22/2011 for the course CHEM 25 taught by Professor X during the Spring '06 term at Lehigh University .

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chapter8 - CHM 25 CHM 25 Spring 2009 2009 Chapter 8...

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