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# A compound formed by elements X and Y has a cubic structure in which X atoms are at the corner of the cube and Y atoms are at the face centers. One atom X is missing from the corner.(b) If all the atoms are removed from one of the faces of the cube containing atoms at corners, as in (a) above, calculate (i) Zeff, (ii) total number of atoms in a cube, and (iii) formula of the compound.

(i) 2.5,(ii) 8,(iii) $X_3,Y_{20}$