Iodine vs Astatine
Pick up to 3 elements and see how they stack up.
| Property | Iodine | Astatine |
|---|---|---|
| Atomic number | 53 | 85 |
| Atomic mass | 126.9 | 210 |
| Electronegativity | 2.66 | 2.2 |
| Melting point | 386.85 K (113.7 °C) | 575 K (301.8 °C) |
| Boiling point | 457.4 K (184.2 °C) | 610 K (336.8 °C) |
| Density | 4.933 g/cm³ | 7 g/cm³ |
| Atomic radius | 198 pm | 202 pm |
| Ionization energy | 10.451 eV | 9.5 eV |
| Discovered | 1811 | 1940 |
| Category | Halogen | Halogen |
| State at room temp. | Solid | Solid |
| Block | p | p |
| Group | 17 | 17 |
| Period | 5 | 6 |
| Valence electrons | 7 | 7 |
| Common charges | −1 | −1 |
| Electron configuration | [Kr] 4d10 5s2 5p5 | [Xe] 4f14 5d10 6s2 6p5 |