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Michele Mercati called magnesia negra manganesa, and finally the metal isolated from it became known as manganese (German: Mangan).The name magnesia eventually was then used to refer only to the white magnesia alba (magnesium oxide), which provided the name magnesium for the free element when it was isolated much later.Neither this mineral nor elemental manganese is magnetic.
Manganese is a chemical element with symbol Mn and atomic number 25.
It is not found as a free element in nature; it is often found in minerals in combination with iron.
Manganate (VI) salts can be produced by dissolving Mn compounds, such as manganese dioxide, in molten alkali while exposed to air.
Permanganate ( 7 oxidation state) compounds are purple, and can give glass a violet color.
However, there are a few examples of low-spin, S =1/2 manganese(II).
The 3 oxidation state is known in compounds like manganese(III) acetate, but these are quite powerful oxidizing agents and also prone to disproportionation in solution, forming manganese(II) and manganese(IV).
Because it was used in glassmaking, manganese dioxide was available for experiments by alchemists, the first chemists.
Ignatius Gottfried Kaim (1770) and Johann Glauber (17th century) discovered that manganese dioxide could be converted to permanganate, a useful laboratory reagent.
The primary decay mode before the most abundant stable isotope, Manganese isotopic contents are typically combined with chromium isotopic contents and have found application in isotope geology and radiometric dating.
Mn–Cr isotopic ratios reinforce the evidence from ).
Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.Tags: Adult Dating, affair dating, sex dating