Q$-4)$ Tungsten $($W$)$ has the BCC structure. The radius of $"$W$"$ atoms is $0\mathrm{.}1371$ nm $.$ The atomic mass of $"$W$"$ is $183\mathrm{.}8\frac{g}{m}ol.$ Calculate the Atomic Concentration per unit cell and density of W$.($Hint $=a_0=\frac{4r}{\sqrt[\phantom{2}]{3}},$ volume of the atom $=\frac{4}{3}{r}^3,$ Density $=\frac{\text{M}\text{a}\text{s}\text{s}}{\text{V}\text{o}\text{l}\text{u}\text{m}\text{e}},=\frac{n_{at}x{M}_{at}}{N_A}$ Avogadro Number $=6\mathrm{.}02214199{10}^{23})(5$ Pts$.)$