# chem

For a primitive cubic unit cell, r=6.0
what is the body diagonal in terms of r, the lattice pt radius

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1. For a primitive unit cell, isn't the side a and the other side is a. Therefore, the diagonal is a^2 + a^2 = diagonal^2. Check me out on this but isn't a the diameter of an atom?

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2. Drbob222 is talking about face diagonal not body diagonal

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3. for body diagonal its c^2=a^2+b^2. B you find from a^2+a^2=b^2 and a is a=2r. Hope that helps.

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