hmmCubic Crystal System (unit cells):
- simple cubic – atom @ each point of the cube, each is shared by 8 other cells à (1/8)*8 corners = 1 atom per cell
- body-centered cubic – 1 atom @ center of the cube + an atom @ each point of the cube (shared by 8 other cells) à[ (1/8)*8 corners]+1 body = 2 atoms per cell
- face-centered cubic – 1 atom embedded @ the center of each cube face (shared with 1 other cell) + an atom @ each point of the cube (shared by 8 other cells) à (1/8) * 8 corners + (1/2) * 6 faces = 4 atoms per cell
Look at my posts here:I was just about to post something on this same topic lol... strange.
thanks for the overview nze, I've been looking around the web for info on this and that is the best explanation I've seen
I do still have a question however... out of acs gchem:
"Copper crystalizes in a face centered lattice. If the edge of the unit cell is 362pm what is the radius of the copper atom?"
the answer is 128pm... I'm assuming there is some ratio to use, but since acs doesn't give explanations and I'm a little lost, if someone could explain how they got this number, I would appreciate it