• # question_answer The number of carbon atoms per unit cell of diamond unit cell is A)  8           B)  6C)  1           D)  4

Diamond has ZnS type structure $\therefore$Number of C atoms $=\underset{Corners}{\mathop{8\times \frac{1}{8}}}\,\,+\underset{fcc}{\mathop{6\times \frac{1}{2}\,}}\,+\underset{(tetrahedral\,voids)}{\mathop{4}}\,$ = 8