The bond lengths of diatomic molecules of elements $X$,$Y$ and $Z$ respectively are $143 \text{ pm}$,$110 \text{ pm}$ and $121 \text{ pm}$. The atomic numbers of $X$,$Y$ and $Z$ respectively are:

  • A
    $9, 7, 8$
  • B
    $7, 8, 9$
  • C
    $9, 8, 7$
  • D
    $7, 9, 8$

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