Chemical Bonding And Molecular Structure

$O_2^{+}< O_2^{-}< O_2$

$O_2< O_2^{-}< O_2^{+}$

$\mathrm{O}_2^{-}<\mathrm{O}_2<\mathrm{O}_2^{+}$

$O_2^{-}< O_2^{+}< O_2$