The bond order and magnetic behaviour of O _ 2 ^ - ion are,...

${O}_{2}^{-}$(Total electron = 17 ) { Bond order $= 1 . 5$, Paramagnetic }

$\sigma1{s}^{2}, {\sigma}^{⋆}1{s}^{2}, \sigma2{s}^{2}, {\sigma}^{⋆}2{s}^{2}, \sigma2{P}_{z}^{2}, \pi2{P}_{x}^{2} = \pi2{P}_{y}^{2}, {\pi}^{*}2{P}_{x}^{2} = {\pi}^{*}2{P}_{y}^{1}, {\sigma}^{⋆}2{{P}_{z}}^{0}$

Number of unpaired electron $= 1$

Bond order $= \dfrac{{n}_{b} - {n}_{a}}{2} = \dfrac{10 - 7}{2} = 1 . 5$