The bond order in $O_2^ + $ is
$2$
$2.5$
$1.5$
$3$
${{\rm{H}}{{\rm{e}}_2}}$ molecule is not possible.
The bond length the species ${O_2},O_2^ + $ and $O_2^ - $ are in the order of
Number of molecules having bond order $2$ from the following molecule is. . . . . . . $\mathrm{C}_2, \mathrm{O}_2, \mathrm{Be}_2, \mathrm{Li}_2, \mathrm{Ne}_2, \mathrm{~N}_2, \mathrm{He}_2$
Use molecular orbital theory to explain why the $Be_{2}$ molecule does not exist.
In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic.