Potassium vs Astatine
| Property | K Potassium | At Astatine |
|---|---|---|
| Atomic number | 19 | 85 |
| Symbol | K | At |
| Name | Potassium | Astatine |
| Category | alkali-metal | halogen |
| Standard Atomic Weight | 39.0983 u | 210 u |
| Period | 4 | 6 |
| Group | 1 | 17 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s1 | [Xe]6s24f145d106p5 |
| Oxidation states | [-1, 1] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 0.82 | 2.2 |
| Electron affinity | 0.5014 eV | 2.391 eV |
| Density | 890 kg/m³ | 7000 kg/m³ |
| Melting point | 63.38 °C | 301.85 °C |
| Boiling point | 758.85 °C | -273.15 °C |
| Discovery year | 1807 | 1940 |