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Xenon

54
Xe
Xenia
Xenon

Even though xenon is the rarest non-radioactive element on earth, it is used for many purposes, for example in xenon arc lamps, which are often found in car headlights. Its name is derived from the Greek word xénos, meaning "strange" or "foreign".

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Xenon in a gas discharge lamp:

Xenon discharge tube.jpg
Von FAL, Link