Fluorine vs Chlorine
Pick up to 3 elements and see how they stack up.
| Property | Fluorine | Chlorine |
|---|---|---|
| Atomic number | 9 | 17 |
| Atomic mass | 18.998 | 35.45 |
| Electronegativity | 3.98 | 3.16 |
| Melting point | 53.48 K (-219.7 °C) | 171.6 K (-101.5 °C) |
| Boiling point | 85.03 K (-188.1 °C) | 239.11 K (-34 °C) |
| Density | 1.696 g/L | 3.214 g/L |
| Atomic radius | 135 pm | 175 pm |
| Ionization energy | 17.423 eV | 12.968 eV |
| Discovered | 1886 | 1774 |
| Category | Halogen | Halogen |
| State at room temp. | Gas | Gas |
| Block | p | p |
| Group | 17 | 17 |
| Period | 2 | 3 |
| Valence electrons | 7 | 7 |
| Common charges | −1 | −1 |
| Electron configuration | [He] 2s2 2p5 | [Ne] 3s2 3p5 |