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Uranium in the environment Although uranium is radioactive, it is not particularly rare.Argon was suspected to be present in air by Henry Cavendish in 1785 but wasn't discovered until 1894 by Lord Rayleigh and Sir William Ramsay.Argon is perticularly important for the metal industry, being used as an inert gas shield in arc welding and cutting.Other uses incude non-reactive blanket in the manufacture of titanium and other reactive elements and as a protective atmosphere for growing silicon and germanium crystals.

This, in turn, influences the Nd ratio of the isotope system provides important information on crustal formation and the isotopic evolution of the solar system.

This chemically inert element is colorless and odorless in both its liquid and gaseous forms. This gas is isolated through liquid air fractionation since the atmosphere contains only 0.94% argon.

The Martian atmosphere in contrast contains 1.6% of Ar-40 and 5 ppm Ar-36.

Thus, as a melt undergoes fractional crystallization from a mafic to a more felsic composition, the abundance of Sm and Nd changes, as does the ratio between Sm and Nd.

Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal. Applications Uranium gained importance with the development of practical uses of nuclear energy.

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