Among the following, the species having the smallest bond is
$NO^-$
$NO^+$
$O_2$
$NO$
The bond order is not three for
The correct order of energies of molecular orbitals of $N _2$ molecule, is
In which of the following transformations, the bond order has increased and the magnetic behaviour has changed?
${{\rm{H}}{{\rm{e}}_2}}$ molecule is not possible.
Oxygen molecule is paramagnetic because