ENGR 220 Ch02_ppt_Callister8e RK Part 2

ENGR 220 Ch02_ppt_Callister8e RK Part 2 - 9/23/11 Types of...

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9/23/11 1 Chapter 2 - 2 5 Types of Bonds Primary Bonds: usually strong Ionic Covalent Metallic Secondary Bonds: usually much weaker Van der Waals or Induced-Induced dipoles Hydrogen Bond or permanent dipole Chapter 2 - 2 6 Let’s Start with the Ionic Bond O Simplest and an analytic expression exists making comparison with experiment possible O Agreement between theory and experiment quite good (within ~10%) O How do you measure bond energy in the lab? – Something to look into outside of class – Think about what’s needed to break bonds ±
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9/23/11 2 Chapter 2 - 2 7 Ionic Bond --> Metal + Non-metal donates accepts electrons electrons Dissimilar electronegativities e.g.: Mg O Mg 1 s 2 2 s 2 2 p 6 3 s 2 O 1 s 2 2 s 2 2 p 4 like [Ne]+3 s 2 Mg 2+ 1 s 2 2 s 2 2 p 6 O 2- 1 s 2 2 s 2 2 p 6 [Ne] [Ne] Cation Anion Chapter 2 - 2 8 Occurs between + and - ions. i.e. bet. Cations and Anions: Requires electron transfer Large difference in electronegativity required Non-directional Classic example: NaCl Ionic Bonding Na (metal) un stable Cl (non-metal) un stable electron + - Coulombic attraction Na + (cation) stable Cl - (anion) stable
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9/23/11 3 Chapter 2 - 2 9 Ionic Bonding For stability, nearest neighbors : Must have? Opposite charges For NaCl : Na has e - structure of?
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This note was uploaded on 10/07/2011 for the course ENGR 220 taught by Professor Barsoum during the Fall '08 term at Drexel.

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ENGR 220 Ch02_ppt_Callister8e RK Part 2 - 9/23/11 Types of...

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