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Behold!
(startrek.website)
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More fluorine facts
Dioxygen difluorine (FOOF) is so reactive (unstable) it decays into O2 and F2 at about 4 % /day at -160 Celsius. It even reacts violently with ice.
Edit: Because everyone liked FOOF, get ready for tetraoxygen difluoride (FOOOOF) which is even more reactive. Apparently reacts explosively with elemental sulfur at -180 Celsius to form SF6.
FOOF
FOOF
There's also tetraoxygen difluoride FOOOOF.
FOOF