Question

5. In a unit cell, atoms A, B, C and D are present at half
of total corners, all face-centres, body-centre and
one third of all edge-centres respectively. Then formula
of unit cell is
(2) ABCD
(1) AB CD
(3) AB.CD
(4) AB.CD2​

Answer 1

Answer:

AB6C2D2 (option are incorrect.)

Explanation:

A : B :C :D

8/2 ×1/8 : 6 ×½ : 1 × 1 : ⅓ × 12 × ¼

½ : 3 : 1 : 1

or 1 :6:2:2

Hence become A½B3CD OR AB6C2D2