What element has the symbol 'Xe'?

The story behind the answer

Xe is the chemical symbol for Xenon, a noble gas in Group 18 with atomic number 54. It’s colorless, dense, and mostly inert, found in trace amounts in Earth’s atmosphere. Xenon is used in high-intensity flash lamps, car headlights, excimer lasers, and even ion propulsion for spacecraft. It was discovered in 1898 by William Ramsay and Morris Travers while studying liquefied air.

Memory tip: “Xe” looks like “XEnon,” and