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Why does copper have a higher melting point than aluminium?

  1. Dec 28, 2014 #1
    Why does copper have a higher melting point than aluminium? Why does the melting point increase as you go down groups anyway?
    Aluminium has higher charge (+3) and a smaller radius, meaning that there is a higher charge density and thus stronger forces of attraction to the lattice. While copper has a charge of +1 and a bigger radius. However, Copper has a higher number of protons, or a stronger positive charge in the nucleus, is this the reason ?
     
  2. jcsd
  3. Dec 28, 2014 #2

    DaveC426913

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    Gold Member

  4. Dec 28, 2014 #3

    Borek

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    Staff: Mentor

    Metallic aluminum has no charge and consists of neutral atoms.
     
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