fluorine

Name fluorine
Symbol F
Atomic Weight 18.9984032
Atomic Number 9
CAS ID 7782-41-4
Group Number 17
Group Name Halogen
Period Number 2
Origin of Name Latin, fluere = "to flow."
Year Discovered 1886
Discovery Credits Isolated by H. Moissan at Paris, France.
Class Non-Metallic
Color Pale yellow
Standard State Gas at 77 F & 298 K
Description Pale yellow gas, most reactive of all elements and the strongest commercially available oxidant. Produced by electrolysis of molten KF2HF. Used to make UF6, SF6 and fluorinating agents such as ClF3. Organic compounds, polymers and salts all used as flux in metallurgy and aluminum making.

Diagnostic tests: 
A sample of the mineral heated in a closed tube with potassium bisulfate (KHSO4) and powdered glass, produces a white sublimate of SiO2 due to the formation of volatile SiF4.

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