The number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each body diagonal is

Options

A. `6`
B. `7`
C. `8`
D. `9`

Answer

4

Explanation

Contribution by `8` atoms at the `8` corners.`=8xx1//8=1` there are `4` body diagonal. Since atoms within the body of the unit cell are not shared by any other unit cell there are `8` more atoms giving a total of `9` atoms.