$A$ crystal is formed by two elements $X$ and $Y$ in a cubic structure. $X$ atoms are at the corners of a cube,while $Y$ atoms are at the face centers. The formula of the compound will be:

  • A
    $XY$
  • B
    $XY_2$
  • C
    $X_2Y_3$
  • D
    $XY_3$

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