Element Fluorine

Fluorine ElementIt is a chemical element with the symbol F and atomic number 9.
Element Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive, as it reacts with almost all other elements, except for helium and neon.
Fluorocarbon gases are generally greenhouse gases with global-warming potentials 100 to 20,000 times that of carbon dioxide.
Organofluorine compounds often persist in the environment due to the strength of the carbon–fluorine bond. Fluorine has no known metabolic role in mammals; a few plants and sea sponges synthesize organofluorine poisons (most often monofluoroacetates) that help deter predation

Names and Identifiers

Chemical Formula:F
CAS:14762-94-8
Molecular Weight:18.99840 g/mol
EC Number :n/a
MDL Number:n/a
Color:pale yellow
Other Names:Fluor, Fluoro
PubChem CID:5360525
IUPAC Name:Fluorine
Inchl:InChI=1S/F
InChI Key:YCKRFDGAMUMZLT-UHFFFAOYSA-N
Canonical SMILES:[F]
ICSC Number:0046

Physical & Chemical Properties

Phase:Gas
Density:1.696 g/L
Boiling Point:85.03 K ​(−188.11 °C, ​−306.60 °F)
Melting Point:53.48 K ​(−219.67 °C, ​−363.41 °F)
Molecular Formula:F
Flash Point:n/a
Exact Mass:18.99840
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H280-H270-H330-H314-EUH071
Precautionary Statements:n/a
Hazard Codes:T+,C
Risk Phrases:7-26-35
Safety Phrases:9-26-36/37/39-45
RIDADR:UN 1045/9192
WGK Germany:3
RTECS:n/a
Packaging Group:n/a
Hazard Class:n/a

Only one isotope of fluorine occurs naturally in abundance, the stable isotope 19F.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
19F18.99840322 (15)1001/22.628867

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
17F17.002095264.5 sEC to 17O5/24.722
18F18.0009381.83 hEC to 18O1
20F19.999981311.00 sβ to 20Ne22.094
21F20.9999494.16 sβ to 21Ne5/2
22F22.003004.23 sβ to 22Ne4
23F23.00372.2 sβ to 23Ne5/2

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