F
Fluorine
Fluorine is a chemical element with the symbol F and atomic number 9. It has a standard atomic weight of 18.998, sits in period 2 and group 17, and is classified as a halogen.
Properties
| Symbol | F |
|---|---|
| Atomic number | 9 |
| Standard atomic weight | 18.998 |
| Category | Halogen |
| Group | 17 |
| Period | 2 |
| Electron configuration | [He] 2s2 2p5 |
| Outer-shell electrons | 7 |
The figure of 18.998 is a standard atomic weight.
Compounds containing fluorine
18 of the compounds in this reference contain F, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| hydrofluoric acid | FH | 1 | 95.0% |
| nitrogen trifluoride | F3N | 3 | 80.3% |
| sulfur hexafluoride | F6S | 6 | 78.0% |
| fluorite | CaF2 | 2 | 48.7% |
| sodium fluoride | FNa | 1 | 45.2% |
| xenon tetrafluoride | F4Xe | 4 | 36.7% |
| sitagliptin | C16H15F6N5O | 6 | 28.0% |
| fluoxetine | C17H18F3NO | 3 | 18.4% |
| fluconazole | C13H12F2N6O | 2 | 12.4% |
| ezetimibe | C24H21F2NO3 | 2 | 9.3% |
| citalopram | C20H21FN2O | 1 | 5.9% |
| midazolam | C18H13ClFN3 | 1 | 5.8% |
| ciprofloxacin | C17H18FN3O3 | 1 | 5.7% |
| haloperidol | C21H23ClFNO2 | 1 | 5.1% |
| dexamethasone | C22H29FO5 | 1 | 4.8% |
| risperidone | C23H27FN4O2 | 1 | 4.6% |
| rosuvastatin | C22H28FN3O6S | 1 | 3.9% |
| atorvastatin | C33H35FN2O5 | 1 | 3.4% |
Calculate with fluorine
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 17
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.