(c) Xenon
Xenon is a gaseous element with symbol Xe and atomic number 54. It is a rare, odourless, colourless, tasteless, chemically unreactive gas. Xenon gas is also known as stranger gas as its volume is very low in the atmosphere (0.08 parts per million). It was discovered in England by the Scottish chemist William Ramsay and British chemist Morris Travers in 1898.
