Chemistry - Solid State Question with Solution | TestHub

In HCP structure for each atom one octahedral void and two tetrahedral voids will be present. No. of atoms $=0.4\times {\mathrm{N}}_{\mathrm{A}}=0.4\times 6.022\times 10^{23}$ No. of tetrahedral voids $=$ No. of atoms $\times 2$ $$\begin{array}{rl}& =0.4\times 6.022\times 10^{23}\times 2\\ & =4.8\times 10^{23}\end{array}$$