How many bonds can there be between two atoms?

[jerromyjon]

Are there any elements or molecules that exchange greater than 4 electrons per bond? I just thought of something off the wall and have no idea what to even google.

 

[Borek]

What about a triple bond in acetylene?

 

[Ygggdrasil]

The record might be twelve electrons shared between two atoms in diatomic ditungsten (W₂) and dimolybdenum (Mo₂): https://en.wikipedia.org/wiki/Sextuple_bond

 

[HAYAO]

I believe several Diatomic uranium complexes have quintuple bond.

A lot of metal-metal bonded complexes contain more than triple bond.

For example, F. A. Cotton's group reported complexes with Cr-Cr and Re-Re quadruple bond. I believe their group also reported sextuple bond as Ygggdrasil said.