86Rn222.01758
Radon
Noble Gas
Gas at STP
Period 6Group 18Block PDiscovered 1900
[Xe]6s2 4f14 5d10 6p6
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
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Atomic Properties
| Atomic Number | 86 |
| Atomic Mass | 222.01758 u |
| Electron Configuration | [Xe]6s2 4f14 5d10 6p6 |
| Oxidation States | 0 |
| Atomic Radius | 220 pm |
| Ionization Energy | 10.745 eV |
| Block | P |
Physical Properties
| Appearance | colorless gas, occasionally glows green or red in discharge tubes |
| Standard State | Gas |
| Melting Point | 202 K (-71.1 °C) |
| Boiling Point | 211.45 K (-61.7 °C) |
| Density | 0.00973 g/L |
| CPK Color | #428296 |
Classification
| Category | Noble Gas |
| Group Block | Noble gas |
| Period | 6 |
| Group | 18 |
| Block | P |
Discovery
| Year Discovered | 1900 |
| Discovered By | Friedrich Ernst Dorn |
| Electron Shells | 2, 8, 18, 32, 18, 8 |