Bonding SL & HL content

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Types of Bonding
• Types of Bonding

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Metallic Bonding
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Structure: regular giant lattice made of close-packed metal cations surrounded by a sea of delocalised electrons Electrons shared between cations, not associated with one particular nucleus of a metal Metallic bond = the electrostatic attraction between a lattice of positive ions and delocalised electrons   Strength of metallic bond: Relatively strong. Depends on: 1. # valance electrons that can be delocalised (more = stronger) 2. charge on metal ion (higher charge = stronger) 3. ionic radius of metallic cation (larger radius = weaker)   Properties: Metal atoms can slide past each other and not break (= ductile & malleable) (ions can slide past and stay connected) Good conductors of heat and electricity (because electrons can flow) Alloys: Mixture of different types of metal ions. Disrupts properties (becomes more brittle) Disrupts packing of the cations Cannot slide as easy

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Ionic Bonding

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