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A unit cell consists of a cube in which ...

A unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres and A atoms are missing from two corners of the each unit cell. What is the simplest formula of the compound ?

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Contribution of A atoms in unit cell =1/8
Number of A atoms in unit cell `=1/8xx6=3/4`
Contribution ofB atoms in unit cell `=1/2`
Number of B atoms in unit cell `=1/2xx6=3`
Formula of unit cell= `A_(3//4)B_3=A_3B_12` or `AB_4`
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