Materials Science 104-Lecture 1 Notes

Materials Science 104-Lecture 1 Notes - Materials Science...

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Materials Science 104 Lecture 1 Interatomic Bonding Primary Bonding (Strong) 1. Ionic Bond 2. Covalent Bond 3. Metallic Bond Secondary Bonding (Relatively Weak) 1. Van der Waals Bond 2. Hydrogen Bond 1) Ionic Bonds: NaCl Na + + Cl - a. Formed by electron transferred from one atom to another b. Found in elements at horizontal extremes of the periodic table i. Atoms can attain inert gas configuration ii. High difference in electronegativity c. Bond force is coulombic attraction of opposite charges d. Ionic bonds are nondirectional i. Magnitude of bond is equal in all directions ii. Na + will attract any adjacent Cl - equallt in all directions e. Relatively high bond energy f. Ionic materials are usually hard and brittle 2) Covalent Bonds a. Electrons shared between two adjacent atoms-sharing of the valence electrons i. Valence election outermost orbital electron that participate in bonding b. Found in atoms closer to each other on periodic table c. Smaller difference in electronegativity
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This note was uploaded on 05/08/2008 for the course MATSCI 104 taught by Professor Lan during the Spring '08 term at UCLA.

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Materials Science 104-Lecture 1 Notes - Materials Science...

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