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Question

A compund has a cubical unit cell in which A atoms are present at face center(s) and body centre. B atoms are present at 4 corners and at one-sixth of the edge centers . The simplest formula for the compound is :


A
A8B
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B
AB8
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C
AB4
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D
A4B
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Solution

The correct option is D A4B
In a cubical unit cell:

Contribution for a corner particle is =18
Contribution for a face centre particle is =12
Contribution for a edge centre particle is =14
Contribution for a body centre particle is =1
A is present at 6 face centres and 1 body centre.
Since there are 12 edge centres,
B is present at 4 corners and 2 edge centres

For A:
Total A atoms in a unit cell=(6×12)+(1×1)=4
For B:
Total B atoms in a unit cell=(4×18)+(2×14)=1
Formula is : A4B

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