Elements / 9
9F18.998
Fluorine
Halogen · p-block · ring L · spoke 17
Fluorine is element 9, a halogen. It sits on ring L (period 2) on spoke 17, the halogens. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 1.7 g/L (as a gas) | Terrain → |
|---|---|---|
| Melting point | 53 K · -220 °C | Terrain → |
| Boiling point | 85 K · -188 °C | Terrain → |
| Electronegativity | 3.98The most electronegative of 100 | Terrain → |
| First ionization energy | 1,681 kJ/mol3rd highest ionization energy of 103 | Terrain → |
| Atomic weight | 18.9984 u | Terrain → |
| Crustal abundance | 585 ppm | Terrain → |
| Discovered | 1771 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Early experimenters with it were dubbed martyrs; the Frenchman who isolated it in 1886 won a Nobel two months before he died.
- Added to toothpaste and drinking water to fight cavities; it is also in the nonstick coating PTFE, better known as Teflon.
Checked against en.wikipedia.org.
Spoke 17: Halogens
Ring L (period 2)
Play with Fluorine
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.