Ch 4.4 Chemical bonding

• How are electrons delocalised?


  -When metal atoms lose outermost shell

  -no longer belongs to atom

  -move freely between metal ions
• What is the metallic bond?

  -strong electrostatic forces of attraction between cations in a metal and sea of delocalised electrons
• What is an alloy?

  mixture of 2 or more elements with one as metal
• What structure does a pure metal have and why?

  made of the same element, hence the atom size is the same, sea of delocalised electrons move freely between metal ions

  -> makes up a regular lattice arrangement
• What structure does an alloy have and why?

  -closely packed, distorted and disrupted layered structure, sea of delocalised electrons move freely between metal ions

  -made of different elements hence, atom size is different

  -> makes up irregular lattice arrangement