Solid Lattices

• types of lattices


  giant metallic lattice

  giant ionic lattice

  giant covalent lattices

  discrete (simple) molecular lattice
• giant ionic lattices


  NaCI: 6:6 co-ordination: each ion is surrounded by 6 other ions

  CsCl: 8:8 co-ordination: each ion is surrounded by 8 other ions
• why structure of NaCI is different from CsCI

  Na+ is much smaller than Cs+ so less Cl- ions can fit around it as they'd be too close so would repel

  Cs+ is larger so more CI- ions can fit without repulsion