|Group||18||Melting point||−71°C, −96°F, 202 K|
|Period||6||Boiling point||−61.7°C, −79.1°F, 211.5 K|
|Block||p||Density (g cm−3)||0.009074|
|Atomic number||86||Relative atomic mass||222|
|State at 20°C||Gas||Key isotopes||211Rn, 220Rn, 222Rn|
|Electron configuration||[Xe] 4f145d106s26p6||CAS number||10043-92-2|
|ChemSpider ID||23240||ChemSpider is a free chemical structure database|
- Radon was first detected as an emission from the radioactive decay of radium.
- It has an atomic number of 86 and represented with the symbol Rn in the periodic table.
- Radon is available in hot springs and some spring water. Its concentration is commonly measured in becquerel ( Bq ) per cubic meter.
- In the air, its concentration varies from 1 and 100 Bq per cubic meter. In some places, well water will be rich in Radon. Even rainwater can be extremely radioactive due to the high concentration of the element.
- Radon (Rn) is colorless, tasteless, odorless gas at standard pressure and temperature and it is the densest noble gas.
- At a temperature below its freezing point, it posses a brilliant yellow phosphorescence.
- It is highly radioactive and chemically unreactive.
- Radon is used to track air masses to a limited level.
- Changes in groundwater radon concentrations help in the prediction of Earthquake.
- In 1940’s radon is used X-ray sources and for industrial radiography.
- A process called Radon hormesis is used to mitigate auto-immune diseases like arthritis.
- It is used in the treatment of cell damage and cancer.
- Radon is also used in radiation therapy.
- Radon occurs mainly in gaseous state and people are mainly exposed to it through breathing air. Exposure to the element through breathing may cause lung disease.
- The best thing about radon is it will not have harmful effects without actual contact with it.