Metallic bonding

• Describe the electron sea model

  A lattice of cations surrounded by a sea of delocalised electrons
• What is metallic bonding

  electrostatic attraction between cations and delocalised electrons
• What are metals properties in a solid state

  • Malleable
• What are metals in a solid state?

  • Malleable
  • Ductile
• What are metals in a solid state?

  • Malleable
  • Ductile (because cations are able to slide over one another without breaking)
  • Can conduct electricity (due to delocalised electrons able to move freely in the metal)
• What properties do metals have in a liquid state?

  • Aren't malleable
  • aren't Ductile (no longer have a lattice of cations)
  • Can conduct electricity (they still have delocalised electrons)
• Why do metals have high melting and boiling points

  They have strong electrostatic forces between their cations and delocalised electrons
• What is the melting point trend of metals across a period

  Melting point increases across a group as they form lattices with more highly charged cations, so they delocalise more electrons per cation
• What is the trend of melting point in metals down a group

  Melting points decrease down a metal group, because distance between cations and electrons gets greater so electrostatic forces get weaker
• What is a pure metal


  Metals made of only one element
• What is an alloy


  Metals made from 2 or more elements