Pure Tungstent
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Pure tungsten metal is easily forged, spun, drawn, and extruded, whereas in an impure state it is brittle and can be fabricated only with difficulty. Tungsten oxidizes in air, especially at higher temperatures, but it is resistant to corrosion and is only slightly attacked by most mineral acids. In keeping with the other TRANSITION ELEMENTS, it displays a range of oxidation states: 0, +1, +2, +3, +4, +5, and +6. This accounts for the many complex ions and coordination complexes in which tungsten can be found. Tungsten is not known to have any biological significance.
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