Describe the metallic bonds as the electrostatic attraction between a lattice of positive ions and delocalised electrons
Metals form a 3D lattice of cations surrounded by a ‘sea’ of 
delocalised electrons. Only the valence electrons become delocalised. The electrons in this arrangement reduce repulsion between the ions.
Malleability – the ability to bend without breaking
Ductility – the ability to be drawn into a wire
By releasing the valence electrons, the metal ions have noble gas configuration. The electrons move about freely between the cations, maintaining a neutral charge all the time.
Explain the electrical conductivity and malleability of metals
Electrical conductivity
This is a result of the delocalised electrons, move freely and respond to the application of a potential difference. The cations will vibrate and cause a barrier to the smooth flow of electrons. Some energy is lost, causing the metal to heat when electricity passes though.
Malleability
Since the cations are surrounded by a sea of delocalised electrons, the electrons are able to move about when the metal is bent, and prevent it from breaking.
