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It's Elemental - The Element Krypton

https://education.jlab.org/itselemental/ele036.html

Wikipedia

Krypton, Chemical Element - uses, elements, metal, gas, number ...

www.chemistryexplained.com/elements/C-K/Krypton.html

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Krypton is used in some types of photographic flashes used in high speed photography. Some fluorescent light bulbs are filled with a mixture of krypton and argon gases. Krypton gas is also combined with other gases to make luminous signs that glow with a greenish-yellow light.

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Physical property: Krypton is a colorless, odorless gas. Chemical property: It has a boiling point of -152.9°C (-243.2°F) Physical property: density of 3.64 grams per liter. That makes krypton about 2.8 times as dense as air.

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Krypton was discovered in Britain in 1898 by Sir William Ramsay, a Scottish chemist, and Morris Travers, an English chemist.

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Symbol: Kr

Atomic number: 36

Atomic mass: 83.798