Xenon

Xenon is a colorless, odorless noble gas with atomic number 54. Its heavy atoms and readily excited electrons make it useful in lighting, medical imaging, and ion propulsion.

Xenon flash lamp: A gas-discharge lamp that produces brief, intense flashes by exciting xenon gas. Excited xenon atoms generate the bright, broad-spectrum flashes used in photography and stroboscopy.
Noble gas: An element in Group 18, characterized by a filled outer electron shell and low chemical reactivity. Xenon belongs to this family, though it forms compounds more readily than the lighter members.
William Ramsay: A Scottish chemist who discovered several noble gases and received the 1904 Nobel Prize in Chemistry. Ramsay and Morris Travers isolated xenon from liquid air in 1898.
Atomic number: The number of protons in an atom’s nucleus, which identifies its chemical element. Xenon’s 54 protons distinguish it from every other element.
Xenon arc lamp: A high-intensity lamp that produces light from an electrical arc through xenon gas. Its daylight-like output makes xenon useful in projectors, searchlights, and vehicle headlamps.
Electron configuration: The arrangement of electrons among an atom’s energy levels and orbitals. Xenon’s filled outer shell explains its low reactivity and its high first ionization energy.
Morris Travers: An English chemist who collaborated with William Ramsay in discovering noble gases. Travers helped identify xenon among the least abundant components of liquid air.
Isotope: One of multiple forms of an element whose atoms have different numbers of neutrons. Natural xenon consists of several isotopes, including radioactive ones used in research.
Xenon anesthesia: The use of inhaled xenon as a general anesthetic. Xenon can induce anesthesia while preserving cardiovascular stability, though its cost limits routine use.
Atomic emission spectrum: The characteristic wavelengths of light emitted by atoms as excited electrons change energy levels. Xenon’s many emission lines produce the distinctive light from its discharge lamps.

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