Neon vs Astatine
| Property | Ne Neon | At Astatine |
|---|---|---|
| Atomic number | 10 | 85 |
| Symbol | Ne | At |
| Name | Neon | Astatine |
| Category | noble-gas | halogen |
| Standard Atomic Weight | 20.1797 u | 210 u |
| Period | 2 | 6 |
| Group | 18 | 17 |
| Block | p | p |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p6 | [Xe]6s24f145d106p5 |
| Oxidation states | [0] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | N/A | 2.2 |
| Electron affinity | -1.2 eV | 2.391 eV |
| Density | 0.8999 kg/m³ | 7000 kg/m³ |
| Melting point | -248.59 °C | 301.85 °C |
| Boiling point | -246.05 °C | -273.15 °C |
| Discovery year | 1898 | 1940 |