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Q. What bond order does $O_{2}^{2-} $ have

Punjab PMETPunjab PMET 2001Chemical Bonding and Molecular Structure

Solution:

Molecular orbital configuration of
$O _{2}^{2-}=\sigma 1 s^{2},\, \sigma^{x} 1 s^{2},\, \sigma 2 s^{2},\, \sigma^{x} 2 s^{2},\, \sigma 2 p^{2}(x)$
Bond order $=\frac{1}{2}(10-8)$
$\pi 2 p_{y}^{2},\, \pi 2 p_{(z)}^{2},\, \pi^{x} 2 p_{(y)}^{2},\, \pi^{x} 2 p_{(z)}^{2}$