Bond order of $O_{2}=\frac{10-7}{2}=1.5$
Bond order of $O_{2}^{2-}=\frac{10-8}{2}=1$
Bond order of $O_{2}=\frac{10-6}{2}=2$
Maximum bond order $=$ minimum bond length.
Bond length is minimum for $O_{2}^{+}$
$PF _5, BrF _4^{-}, IF _5 ; BrF _5, XeOF _4, ICl _4^{-}$
(સમાન આકાર અને સંકરણ ધરાવતી)