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A compound formed by elements A and B cr...

A compound formed by elements `A` and `B` crystallises in a cubic structure where `A` atoms are present at the corners of a cube and the `B` atoms are present at the face centres.The formula of the compound is

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A atoms from 8 corners of a cube = `1/8xx8`=1
B atoms from 6 face centres in unit cell = `1/2xx6`=3
Hence, formula of compound = `AB_3`.
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