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| Radon | Radon | Radon | Radon | Radon | ||||||||||||||||||||
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Rn Radon |
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- Radon was discovered by Friedrich Ernst Dorn (Germany) in 1900. The origin of the name is variation of the name of element radium; radon was called niton at first, from the Latin word nitens meaning shining. It is colourless, odourless radioactive, heavy, noble gas. Chemically inert and non-flammable. Highly radiotoxic. Carcinogen by inhalation.
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NOBLE GASES | |
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| Relative atomic mass: | [222] | Electronic configuration: | [Xe] 4f14 5d10 6s2 6p6 |
| Formal oxidation number: | 0 | Electronegativities: | - |
| Thermal conductivity: | 0.0036 W m-1 K-1 | Electrical resistivity (20 °C): | - μΩcm |
| Atomic radius: | 240 pm | Standard state (20 °C): | gas |
| Density (g dm-3): | 4400 (liquid, b.p.) 9.73 (gas, 273 K) |
Molar volume (cm3 mol-1): | 50.45 (liquid, b.p.) 22816.03 (gas, 273 K) |
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THERMAL PROPERTIES | |
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| Melting point: | -71 °C | Heat of fusion: | 2.7 kJ mol-1 |
| Boiling point: | -61.7 °C | Heat of vaporization: | 18.1 kJ mol-1 |
| Critical temperature: | 104 °C | Heat of atomization: | 0 kJ mol-1 |
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IONIZATION ENERGIES AND ABUNDANCE | |
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| 1st ionization energy: | 1037.08 kJ mol-1 | Abundance of element (air): | - ppm |
| 2nd ionization energy: | - kJ mol-1 | Abundance of element (Earth's crust): | - ppm |
| 3rd ionization energy: | - kJ mol-1 | Abundance of element (oceans): | 9E-15 ppm |
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ISOTOPES | |
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Isotopes | Relative atomic mass | Abundance (%) |
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211Rn | 210.990585(8) | * |
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222Rn | 222.017570(3) | * |
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MINERALS AND USES | |
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- Radon is formed from the decay of radium in the earths crust. Used to treat some forms of cancer.
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REDUCTION POTENTIALS | |
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Balanced half-reaction | Eo / V | Annotation |
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