Lecture 4 - ES202 Materials Science and Engineering Science...

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ES202 : Materials cience and Engineering Science and Engineering
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Previous Lecture Materials can be categorized as crystalline and amorphous Material properties are dependent of structure and arrangement of atoms L west energy, stable position of two atoms defines oe s teeg y , stab e pos t o o to ato s de es bond length and bond energy nic bonds are oulombic nature non Ionic bonds are Coulombic in nature, non directional and strong in nature Electronegativity affects formation of ionic bond 8/1/2013 IIT Gandhinagar 2
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Covalent Bonding Sharing of electron to achieve stable electron configuration (noble gas) Example CH 4 , Molecules (Cl 2 , H 2 ), H 2 O, elemental solids (diamond, silicon, germanium) Directional – between atoms sharing electrons Number of covalent bonds:(8 N) where N is the number of valence electron Bond may be strong or weak (wide range of bonding energies) 3
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Covalent Bonding
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%Bond Characteristics Interatomic bonds can be partially ionic and
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Lecture 4 - ES202 Materials Science and Engineering Science...

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