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Question

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 ?

A
AB3CD3
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B
ABCD
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C
AB6C2D4
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D
AB6C2D2
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Solution

The correct option is D AB6C2D2
Atoms at the corner in a unit cell is 1
No of atoms of A in one unit cell = 12
Atoms at the corner in a unit cell is 3
No of atoms of B in one unit cell = 3
Atoms at the body center in a unit cell is 1
No of atoms of C in one unit cell = 1
Atoms at the edge center in a unit cell is 3
No of atoms of D in one unit cell = 1
Formula is A12B3CDorAB6C2D2

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