# Why is the F-F bond in fluorine a p-p sigma bond?

Won't the lone pairs hybridize to $$\mathrm{sp^3}$$ making it an $$\mathrm{sp^3}$$-$$\mathrm{sp^3}$$ $$\sigma$$ bond? If it still is $$\mathrm{p^\sigma}$$-$$\mathrm{p^\sigma}$$ bond what is the spatial location of the lone pairs?

• It certainly won't. What you can do is to use the hybridization model to describe the bonding in F-F. The bond is surely not made only by pure p-p overlap. – RBW Nov 28 '15 at 13:38
• @Marko Yes it is … – Jan Nov 29 '15 at 12:57
• There is contribution from 2sigma and 1pi(u) MOs to the F-F bond: image.slidesharecdn.com/… – RBW Nov 29 '15 at 13:35

So the $\ce{F-F}$ bond is indeed a $\mathrm{p^\unicode[Times]{x3c3}\ce{-}p^\unicode[Times]{x3c3}}$ bond because it makes the overall system energetically favourable.