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Krypton

Discription:

▫️light bulbs
▫️open signs
▫️high speed photographic flashes
▫️lasers

▫️krypton was invented by sir William Ramsey he was a Scottish chemist. While learning about liquified air tiny amount of krypton stayed behind after the volatile components of liquid air boiled away.

▫️KR (symbol)
▫️earths atmosphere is about 0.0001% krypton
▫️colorless
▫️-251.25 degrees F