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Aluminium metal has face centred cubic (...

Aluminium metal has face centred cubic (f.c.c) structure. The number of 'Al' atoms per unit cell of the lattice is

A

2

B

1

C

4

D

6

Text Solution

Verified by Experts

The correct Answer is:
C
In a unit cell there are 8 corners and 6 faces. Since each corner of the unit cell is shared two eight unit cells, and each face is shared by two unit cells, the number fo points per face unit cell
`Z=8times1/8+6times1/2=1+3=4`
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