Posted by Josh on Sunday, February 21, 2010 at 8:09pm.
so you have an atom at each corner. Draw a line thru corner to corner along the diagnol. One atom in the center of the face. So the length of the line is 4radii. So the edge of the cell must be .707*4 radii. You can get the radii from the periodic table.
Your teacher might want you to find it from density of gold.
Each corner has 1/8 of an atom, each face 1/2 of an atom. That is 1+3 atoms per cell. You know the mass of each atom (atom mass/avag number), multipy it by 4, that is the mass of each cell.
density= mass/volume= mass/edge^3 solve for edge.
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