The number of atoms contained in a fcc units cell of a monatomic substance is

Options

A. `1`
B. `2`
C. `4`
D. `6`

Answer

3

Explanation

A face-centered cubic unit cell is a cubic unit celll in which there are lattice points at the centre of each face of the unit cell is addition to those at the corners.Exclusive contribution of lattice points all the corners per unit cell =`8xx1//8=1` Exclusively contribution of lattice points at the face centres per unit cell`=6xx1//2=3`
Thus total number of atoms per fcc unit cell `=1+4=4`