Key information
Atomic number: 
9
Atomic weight: 
19
Density: 
1505 kg/m³
Boiling point: 
84.96° K
Melting point: 
53.56° K
Heat vapour: 
3.16 kJ/mol
Heat fusion: 
0.26 kJ/mol
Group: 
Halogen Elements

Fluorine is a univalent, poisonous, gaseous halogen. It is pale yellow in colour. It is a highly reactive element, combining directly with nearly all the elements, and can for example react to form compounds with group 18 elements known as the inert gases.

The discovery of the element fluorine is credited to the French chemist Henri Moissan who first isolated it in 1886.

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages