The number of atoms in body centred and face centred cubic unit cell respectively are

• Correct answer
  A

  2 and 4
• B

  4 and 3
• C

  1 and 2
• D

  4 and 6

Solution

$Z_{\mathrm{BCC}}=\frac{1}{8} \times 8+1=2 \quad Z_{\mathrm{FCC}}=\frac{1}{8} \times 8+\frac{1}{2} \times 6=1+3=4$

Hence, the correct answer is option: 'A'.