Bonding SL & HL content

Types of Bonding

• Types of Bonding

Metallic Bonding

• 
• 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

Ionic Bonding

Slide 4