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heaviest element with a known biological function (used by some enzymes), and as such is not harmful to humans and animals in quantities typically encountered in the environment. the aforementioned scheelite and wolframite are the two main mineral sources of tungsten; other less common minerals include...
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vapor that reacted with the copper. at this time, brass became widely used in coinage and military equipment, and the methods for producing it spread around the world. by the th century in india and th century in china, the metallic formof zinc was finally produced deliberately, and a variety of european...
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