Solved Homework StatementMetal Fluoride Crystallizes in a Cubic Structure

[susan__t]

Homework Statement

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

 

[Borek]

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.