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AC LEC 03-09 - Lecture 3 Atomic Bonding Primary...

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Lecture 3 - Atomic Bonding Primary Bonds (Strong) Ionic Covalent Metallic Secondary Bonding (Weak) van der Waals Mixed Bond Character ionic-covalent metallic-covalent metallic-ionic Sodium Metal Chlorine Gas Table Salt
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IONIC BONDING Sodium and Chlorine: Sodium looses 1 valence electron while Chlorine accepts 1 electron to complete outer shell Na: 0.192 nm Cl: 0.099 nm + -
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IONIC BONDING: MOVIE IonicBonding.mov
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INTER-IONIC FORCES AND ENERGIES Attraction: between nucleus and electron cloud Repulsion: between two electron clouds EQUILIBRIUM DISTANCE When Net Force = 0 OR When Net Energy is MINIMUM Repulsion: (b) / (a n ) Separation = a
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INTER-IONIC FORCES AND ENERGIES 1 MOVIE: INTERATOMIC FORCES Shortcut to BND_FORC.lnk
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3 DIMENSIONAL IONIC SOLIDS Criteria for fitting cations and anions charge neutrality size fit must touch As ratio of cation (+ve) to anion (-ve) radius decreases, fewer anions surround central cation CsCl: CN = 8 NaCl: CN = 6 Cs + Cl Na
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Relative Sizes of the Atoms/Ions DECREASE important when atoms/ions come together in the solid state.
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