In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the facecentre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is
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(3) No. of A atom = 1/8 x 8=1No. of B atom = 1/2 x 6-1/2=5/2
Hence, formula of compound is AB 5/2 or A2B5.