Fluorine vs Astatine
| Property | F Fluorine | At Astatine |
|---|---|---|
| Atomic number | 9 | 85 |
| Symbol | F | At |
| Name | Fluorine | Astatine |
| Category | halogen | halogen |
| Standard Atomic Weight | 18.998403 u | 210 u |
| Period | 2 | 6 |
| Group | 17 | 17 |
| Block | p | p |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p5 | [Xe]6s24f145d106p5 |
| Oxidation states | -1 | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 3.98 | 2.2 |
| Electron affinity | 3.4011 eV | 2.391 eV |
| Density | 1.696 kg/m³ | 7000 kg/m³ |
| Melting point | -219.62 °C | 301.85 °C |
| Boiling point | -188.12 °C | -273.15 °C |
| Discovery year | 1886 | 1940 |