Element Fluorine
It 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: |   |
| 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
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 19F | 18.99840322 (15) | 100 | 1/2 | 2.628867 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 17F | 17.0020952 | 64.5 s | EC to 17O | 5/2 | 4.722 |
| 18F | 18.000938 | 1.83 h | EC to 18O | 1 | |
| 20F | 19.9999813 | 11.00 s | β– to 20Ne | 2 | 2.094 |
| 21F | 20.999949 | 4.16 s | β– to 21Ne | 5/2 | |
| 22F | 22.00300 | 4.23 s | β– to 22Ne | 4 | |
| 23F | 23.0037 | 2.2 s | β– to 23Ne | 5/2 |