Xenon has nine stable istopes of which the most common is 132Xe. Xenon-133 is a radioactive isotope with a half-life of about 5 days that is used in ventilation scanning of the lungs in nuclear medicine. It gives off beta particle, which are responsible which are responsible for the relatively high radiation dose compared to krypton-81m.
Xenon forms a small number of covalent compounds with fluorine and oxygen, showing oxidation numbers +2, +4, +6, and +8. They are reactive and highly oxidizing, and are unstable in acid solution. Most of the crystalline xenate (VIII) salts (XeO64-) are stable.
Xenon was discovered in 1898 by William Ramsay and his assistant, Morris William Travers, shortly after they had identified neon and krypton.
Related category INORGANIC CHEMISTRY
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