Question

The effective number of atoms present in a simple cubic unit cell is

Answer 1

Simple cubic unit cell: A unit cell in which all the eight corners of the cube are occupied by the atoms. Each such atom is shared by 8 such unit cells. So each Corner atom contributes ${\frac{1}{8}}^{th}$ portion to the unit cell.

No of atoms present in this unit cell
= $8\times \frac{1}{8}$ = 1