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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: colin9690 on March 07, 2011, 04:49:28 PM

Title: Empty Space in Face Centered Cubic?
Post by: colin9690 on March 07, 2011, 04:49:28 PM

"Calculate the percentage of empty space in a face centered cubic lattice, and show that it does not depend on the edge length of the unit cell or on the size of the atoms in the unit cell."

My attempt                 I'm really confused on this problem. I know that in a face centered cubic, there are are total of 4 atoms. That's as far as I can get, I guess I feel like the problem isn't giving me enough information.

Title: Re: Empty Space in Face Centered Cubic?
Post by: opti384 on March 07, 2011, 10:14:20 PM

First of all don't worry about the length and all those stuff. You can just say that the length of an edge is 1.

And then try to find the radius of the atoms in the lattice.

Title: Re: Empty Space in Face Centered Cubic?
Post by: AWK on March 08, 2011, 01:12:37 AM

Quote from: opti384 on March 07, 2011, 10:14:20 PM

First of all don't worry about the length and all those stuff. You can just say that the length of an edge is 1.

And then try to find the radius of the atoms in the lattice.

And radii of tetrahedral and octahedral holes