The crystal structure of the solid compound $XY$ is similar to $NaCl$. If the radius of the cation $X^+$ is $100 \, pm$, then the radius of the anion $Y^-$ will be ......... $pm$.

  • A
    $241.5$
  • B
    $165.7$
  • C
    $275.1$
  • D
    $322.5$

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