| Rn | Radon | Atomic number : 86 Relative atomic mass (12C = 12.0000) : 222.0176 (Rn-222) |
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| P H Y S I C A L D A T A | |
| Group 18 noble gas Density / kg m-3 : n.a. [s.]; 440 [liq., b.p.]; 9.73 [gas, 273 K] |
Melting point / K : 202 Boiling point / K : 211.4 |
| D I S C O V E R Y | |
| Discovered in 1900 by F.E. Dorn at Halle, Germany. |
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| G E O L O G I C A L D A T A | |
| Abundances Sun (relative to H = 1 × 1012) : n.a. Earth's crust / p.p.m. : traces Atmosphere / p.p.m. (volume) : 1 × 10-15 Oxidation state : 0 |
Seawater / p.p.m. : c. 1 × 10-14 |
| B I O L O G I C A L D A T A | |
| Level in humans Organs: virtually nil |
Daily dietary intake : nil Total mass of element in average (70 kg) person : virually nil |
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A portrait of radon is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |