9
F
18.998
Fluorine
Element 9 · 18.998 u · p-block
nonmetal
The most electronegative and reactive element. Used in toothpaste (as fluoride) and Teflon coatings.
Phase (STP)
Gas
Melting Point
-219.67 °C
Boiling Point
-188.11 °C
Density
0.001696 g/cm³
Electronegativity
3.98
Atomic Radius
50 pm
Ionization Energy
1681 kJ/mol
Electron Affinity
328 kJ/mol
Discovered
1886 · Henri Moissan
Electron Configuration
[He] 2s2 2p5
Electron Orbitals
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