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A cubic structure is formed where atoms of element $X$ are occupied at corner of cube and also at face centers. Atoms of element $Y$ are present at body center and at the edge centers. If all the atoms are removed along a plane passing through the middle of the cube (bisecting the four edges), the formula will become
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The correct answer is:
$X Y$
- $=X$, at corners (cor) and face centre (fc)
$\mathbf{-}=Y$, at edge centre $(\mathrm{ec})$ and body centre $(\mathrm{bc})$
After removal, number of atoms ratio in the crystal,
So, formula of the crystal will be $X Y$.
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