HW$-11$: Show that the atomic packing factor$($APF$)$ of BCC$($Body Centered Cubic$)$ is $0\mathrm{.}68?$ Please see pages$-14$ and $18$ to help with the solution.

HW$-12$: Show that the atomic packing factor$($APF$)$ of SC$($Simple Cubic$)$ is $0\mathrm{.}5236?$ Please see page$-18$ to help with the solution.

HW$-13$: Calculate the radius of an iridium atom, given that Ir has an FCC$($Face Centered Cubic$)$ crystal structure, a density of $22\mathrm{.}4\frac{g}{c}m3,$ and an atomic weight of $192\mathrm{.}2\frac{g}{m}ol?$ Please see pages$-10,11,$ and $18$ to help with the solution.

HW$-14$: Obtain the density $()$ unit of the crystalline material using the formulation? Please see page$-18$ to help with the solution.