Name xenon
Symbol Xe
Atomic Weight 131.293
Atomic Number 54
CAS ID 7440-63-3
Group Number 18
Group Name Noble Gas
Period Number 5
Origin of Name Greek, xenos = "stranger."
Year Discovered 1898
Discovery Credits Sir William Ramsay and M. W. Travers at London, UK.
Class Non-Metallic
Color Colorless
Standard State Gas at 77 F & 298 K
Description Colorless, odorless gas obtained from liquid air. Inert toward most other chemicals but reacts with fluorine gas to form xenon fluorides. Oxides, acids and salt known. Little used outside research. Used to fill the bulbs of zenon flashlights.

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