9F18.998
Fluorine (F)
Element 9 Ā· Halogen
Fluorine (F) is a chemical element with atomic number 9. It is classified as a halogen in period 2, group 17 of the periodic table (the p-block). Its standard atomic weight is 18.998 u and its ground-state electron configuration is [He] 2sĀ² 2pāµ.
Fluorine facts
| Atomic number (Z) | 9 |
|---|---|
| Symbol | F |
| Standard atomic weight | 18.998 u |
| Category | Halogen |
| Group | 17 |
| Period | 2 |
| Block | p-block |
| Electron configuration | [He] 2sĀ² 2pāµ |
| Electronegativity (Pauling) | 3.98 |
| State at 20 Ā°C | Gas |
| Protons / electrons | 9 / 9 |
| Neutrons (most common isotope, approx.) | 10 |
| Molar mass | 18.998 g/mol |