## Chemistry and Chemical Reactivity (9th Edition)

a) From the figure it's a body-centerd cubic lattice. b) $8\times 1/8=1$ in the vertexes and one in the center, 2 in total c) Diagonal of the cube: $l.\sqrt3=4.r\rightarrow r=l\times \frac{\sqrt3}{4}$ $r=137\ pm$