Not known, probably the formation of francium fluoride.
Plus, due to them being the MOST reactive elements, there would be a rather large explosion (the largest chemical reaction only exceeded by a nuclear reaction).
your mom happens
Farts Happen
No
Jesus is re-incarnated.
Macaroni
Gcgui
it depends on what is mixed together
Nothing "happens".
What happens if I mixed 5/20 and 5/30 synthetic oil together on accident
Pokemon!
when you mixed liquid to another liquid its mix together
Brown
it becomes an alloy
creates a toxic gas
Either nothing or a chemical reaction.
It makes natural grey.
To see what happens when chemicals are mixed together and also work out equations