The number of species from the following which are paramagnetic and with bond order equal to one is___________

$\mathrm{H}_2, \mathrm{He}_2^{+}, \mathrm{O}_2^{+}, \mathrm{N}_2^{2-}, \mathrm{O}_2^{2-}, \mathrm{F}_2, \mathrm{Ne}_2^{+}, \mathrm{B}_2$

  • [JEE MAIN 2024]
  • A

    $3$

  • B

    $7$

  • C

    $6$

  • D

    $1$

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$\mathrm{Li}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_{2} \mathrm{O}_{2}, \mathrm{KO}_{2}, \mathrm{MgO}$ and $\mathrm{K}_{2} \mathrm{O}$

  • [JEE MAIN 2021]

Give electron configuration, bond order magnetic property and energy diagram for Lithium $\left( {{\rm{L}}{{\rm{i}}_2}} \right)$ molecule.