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Q. How many species of the following would involve sp mixing?
$B _{2}, O _{2}, F _{2}, N _{2}, O _{2}^{+}, F _{2}^{-}, C _{2}, O _{2}^{-}$

Chemical Bonding and Molecular Structure

Solution:

$\left(B_{2}, N_{2}, C_{2}\right)$
Homodiatomic species up to nitrogen show $s-p$ mixing due to less energy difference between $2 s$ and $2 p$ orbitals.