Radon • Noble Gases
Primary XPS region: Rn4f
Overlapping regions: Ar2p, Rb3p
Binding energies of common chemical states:
|Chemical state||Binding energy Rn4f7/2|
- Unlikely to be seen in XPS unless implanted into samples.
About this element
Date of discovery: 1898
Name origin: from radium
Discoverer: Fredrich Ernst Dorn
Obtained from: decay of radium
Melting point: 202 K
Boiling point: 211 K
Molar volume: 50.50 × 10-6 m3/mol
Shell structure: 2,8,18,32,18,8
Electron configuration: [Xe]4f145d106s26p6
Oxidation state: 0
Crystal structure: cubic
Radon, the heaviest of the gases, was discovered in 1898 by F.E. Dorn. Colorless at standard temperature, radon exhibits brilliant yellow phosphorescence when cooled below its freezing point and becomes orange-red as the temperature is lowered. This element is formed by the natural breakdown of radium, a decay product of uranium commonly found in the earth’s crust. Radon can also be found naturally in some spring waters. As a radioactive gas with a short half-life, radon forms decay products that damage lung tissue when inhaled, making the element a major health hazard.
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