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Close packing in an FCC lattice

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Potassium bromide, KBr, crystallizes like NaCl in a face centered cubic lattice. The ionic radius of K+ is 133 pm and the ionic radius of Br- is 195 pm. Assuming that all Br- ions are positioned in the face and corners of the unit cell, while the K+ ions are positioned along the edge alternating between anions, calculate the length of a unit cell edge. Show work and thanks for your help and time.

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Solution Summary

The solution includes cartoons that demonstrate the close packing of FCC lattice and explains how to find the unit cell dimensions.

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Please see the attached file.

Check out the following websites:
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch13/unitcell.html
http://www.kings.edu/~chemlab/vrml/
http://itl.chem.ufl.edu/2041_f97/lectures/lec_h.html

We use the principle that in a ...

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