$AX$ is a covalent diatomic molecule where $A$ and $X$ are second row elements of periodic table. Based on Molecular orbital theory, the bond order of $AX$ is $2.5$. The total number of electrons in $AX$ is ........... (Round off to the Nearest Integer).

  • [JEE MAIN 2021]
  • A

    $30$

  • B

    $25$

  • C

    $20$

  • D

    $15$

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