For a primitive cubic unit cell, r=6.0

Question

what is the body diagonal in terms of r, the lattice pt radius

Answer 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?

Answer 2

Drbob222 is talking about face diagonal not body diagonal

Answer 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.