Question

05 which of the following has two atoms bec Unit Cell?
(1) Fcc
(7) BCC (1) Primitive Unit Cell None
of these.​

Answer 1

Answer:

The number of atoms per unit cell in a simple cubic, face-centered cubic and body-centred cubic are 1,4,2 respectively.

ans. is BCC

Explanation:

The number of atoms contained in one body-centred cubic unit cell of monoatomic substance is 2.

8 atoms are present at 8 corners of a bcc unit cell. Each atom contributes one eigth to the unit cell. Total contribution =8×

8

1

=1

1 atom is present at body centre of a bcc unit cell. The atom contributes fully to the unit cell. Total contribution =1×

1

1

=1

Total number of atoms in one fcc unit cell =1+1=2.