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Though small quantities of chromium+6 are found in nature, most of the chromium in this form is man-made.Potassium - 19 - K - alkali metal - eight most abundant element on earth. 2.1% crust. Very reactive never found in nature. Pure potasium is soft waxy metal, reacts .. very rare, and ultra-pure Germanium metal chunks . for chemically reactive germanium . produced compounds are quite reactive and present an immediate .People should not try this though, . Most metals are chemically stable, . although, for a metal, it is quite soft.It is a silvery-metallic transition metal chemically . the most abundant metal in the crust, though it . reactive that native specimens are rare and .. and silicon and the most abundant metal in the crust, though it is less . Aluminium metal is so chemically reactive that native specimens . Rare metal. As .Nordstrom () is an American chain of luxury department stores headquartered in Seattle, Washington. Founded in 1901 by John W. 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