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Homework Help: Deriving the cooridinate numbers of both ions in rock salt

  1. Nov 24, 2007 #1
    How would I go about deriving the cooridinate numbers of both ions in rock salt, and,
    how could I account for the differences in lattice enthalpy between the following;

    LiCl (861 kJ/mole) - NaCl (787)
    LiCl - LiF (1046)
    LiCl - MgO (3850)

  2. jcsd
  3. Nov 24, 2007 #2


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  4. Nov 24, 2007 #3
    Well I do know that a coordinate number is the number of atoms surrounding an atom in a solid state lattice

    And for the second bit, I assume LiCl would have a larger lattice energy due to the greater difference in electronegativity of both consituents, similiar with the next one. Not sure about the last one.
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