Krypton

Properties, Uses, & Facts

Oct 10, 2023 - 04:23
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krypton

krypton (Kr), chemical element, a rare gas of Group 18 (noble gases) of the periodic table, which forms relatively few chemical compounds. About three times heavier than air, krypton is colourless, odourless, tasteless, and monatomic. Although traces are present in meteorites and minerals, krypton is more plentiful in Earth’s atmosphere, which contains 1.14 parts per million by volume of krypton. The element was discovered in 1898 by the British chemists Sir William Ramsay and Morris W. Travers in the residue left after a sample of liquid air had boiled almost entirely away.

Element Properties
atomic number36
atomic weight83.798
melting point−157.4 °C (−251.3 °F)
boiling point−153.4 °C (−244.1 °F)
density (1 atm, 0 °C [32 °F])3.733 g/litre (0.049 ounce/gallon)
oxidation numbers0, 2
electron configuration(Ar)3d104s24p6

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