Argon
Argon is named from the Greek argos, inactive and was discovered in 1894. In nature it is found in the atmosphere (0.94%) and is obtained by fractionation of liquid air. It is a colorless and odorless gas, is very inert and does not form true chemical compounds. It is used in electric light bulbs and in fluorescent tubes. Argon is also used as an inert gas shield for arc welding and cutting, as a blanket for the production of titanium and other reactive elements and as a protective atmosphere for growing silicon and germanium crystals.