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 DA4B 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