Flu­or­ine found as an element

Flu­or­ine is the most elec­troneg­at­ive ele­ment and so super-​reactive. So we’d only expect to find it as a com­pound. Now some ele­mental flu­or­ine has been detec­ted in the fluor­spar min­eral ant­o­zon­ite using 19F NMR spec­tro­scopy. The fuor­ine is pro­duced in ele­mental form due to the effect of ion­ising radi­ation from very small quant­it­ies of uranium in the min­eral. Read more here.