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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 also at alternate face centers. Y atoms are present at the body center and also at the alternate edge center of the cube.(d) If all the atoms are removed from one of the plane passing through the middle of the cube which neither contains atoms on the edge center nor on the face center, calculate (i) $Z_{eff}$, (ii) total number of atoms in a cube, and (iii) formula of the compound.

(i) 3,(ii) 1,(iii) $X_2Y$