Present in trace amounts in the atmosphere, this element's 133 isotope can be used for radioactive  dating.
Present in trace amounts in the atmosphere, this element's 133 isotope can be used for radioactive  dating. This colorless gas emits a characteristic blue glow in a plasma discharge. This element was  discovered in late nineteenth century England by William Ramsay and Morris Travers when they were  evaporating liquefied air. With atomic number 54, this element's most famous use is in its namesake flash lamps and it the first noble gas with which a compound was synthesized. FTP, name this second-heaviest of the noble gases.
Present in trace amounts in the atmosphere, this element's 133 isotope can be used for radioactive  dating.
xenon