metallic bonding

• metallic bonding

  • the electrostatic attraction between a lattice of positive ions surrounded by delocalised electrons
  • metal atoms achieve a full outer shell by releasing the outer shell electrons which results in a lattice of positive ions and a sea of delocalised electrons. these electrons float about and are not associated to a particular atom
• metal properties

  • shiny
  • hard
  • high melting point
  • good conductors of electricity and heat
  • malleable and ductile
  • sonorous
• metallic bonding

  • layers of metal ions can slide over one another without breaking as there are no fixed bonds, instead, the delocalised electrons move with the moving layers
  • more electrons are donated per atom. this means the ions are held more strongly
• metal alloys

  • an alloy is a mixture of two or more elements, where at least one is a metal. many alloys are mixtures of two or more metals.
  • properties = stronger, have a higher melting point, less easily corroded, lighter.
• metal alloy strength

  • in a normal metal, the atoms are arranged in a regular structure
  • in an alloy, the atoms of the second element fit into the spaces between the metal atoms
  • having atoms in these spaces makes it more difficult for the layers to slide over eachother