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Radon (Rn)
Atomic number 86 · noble
| Atomic number | 86 |
|---|---|
| Atomic mass | 222.0 u |
| Molar mass | 222.0 g/mol |
| Category | noble |
| Group / period / block | 18 / 6 / p |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p6 |
| Electrons per shell | 2, 8, 18, 32, 18, 8 |
| Density | 0.00907 g/cm³ |
| First ionisation energy | 10.7485 eV |
| Melting point | 202.15 K (-71.00 °C) |
| Boiling point | 211.45 K (-61.70 °C) |
Uses
Once cancer therapy; indoor radiation hazard
Discovery
1898, Fredrich Ernst Dorn