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Homework Help: Lattice positions etc

  1. Dec 7, 2008 #1
    1. The problem statement, all variables and given/known data

    A metal fluoride crystallizes in a cubic structure such that the fluoride ions occupy lattice positions at the corners and on the faces while 4 metal atoms occupy positions within the body of the unit cells. The formula of the metal fluoride is?

    I don't know where to start or what equations are relevant. all i know is that i'm pretty sure this is a face centered cubic structure
  2. jcsd
  3. Dec 8, 2008 #2


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    Staff: Mentor

    How many atoms of each element per unit cell? Note that atoms lying on the border have only their part in unit cell, so you have to sum fractions.
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