Original author unknown, Creative Commons License (Wikipedia) : flow or flux Properties: Fluorine has a melting point of -219.62°C (1 atm), boiling point of -188.14°C (1 atm), density of 1.696 g/l (0°C, 1 atm), specific gravity of liquid of 1.108 at its boiling point, and valence of 1. It is highly reactive, participating in reactions with virtually all organic and inorganic substances. Metals, glass, ceramics, carbon, and water will burn with a bright flame in fluorine.
It is possible that fluorine can substitute for hydrogen in organic reactions.
Items such as bone that are in the soil will absorb fluoride from the groundwater over time.
From the amount of absorbed fluoride in the item, the time that the item has been in the soil can be estimated.
Once an organism is dead, however, no new carbon is actively absorbed by its tissues, and its carbon 14 gradually decays.
Libby thus reasoned that by measuring carbon 14 levels in the remains of an organism that died long ago, one could estimate the time of its death.
As not all objects absorb fluorine at the same rate, this also undermines the accuracy of such a dating technique.
Carbon 14 has a half-life of 5,780 years, and is continuously created in Earth's atmosphere through the interaction of nitrogen and gamma rays from outer space.
Because atmospheric carbon 14 arises at about the same rate that the atom decays, Earth's levels of carbon 14 have remained fairly constant.
This a simulant, showing how fluorine appears (though the actual gas would be less intensely colored in small volumes).
The real element would corrode even borosilicate glass.