Potassium argon is a radiometric dating method that involves

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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 ).Johan Gottlieb Gahn was the first to isolate an impure sample of manganese metal in 1774, which he did by reducing the dioxide with carbon.Manganese phosphating is used for rust and corrosion prevention on steel.Solid compounds of manganese(III) are characterized by its strong purple-red color and a preference for distorted octahedral coordination resulting from the Jahn-Teller effect.The oxidation state 5 can be produced by dissolving manganese dioxide in molten sodium nitrite.Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.Historically, manganese is named for pyrolusite and other black minerals from the region of Magnesia in Greece, which also gave its name to magnesium and the iron ore magnetite.

Potassium permanganate, also called Condy's crystals, is a commonly used laboratory reagent because of its oxidizing properties; it is used as a topical medicine (for example, in the treatment of fish diseases).

Solutions of potassium permanganate were among the first stains and fixatives to be used in the preparation of biological cells and tissues for electron microscopy. In ancient times, two black minerals from Magnesia (located within modern Greece) were both called magnes from their place of origin, but were thought to differ in gender.

The male magnes attracted iron, and was the iron ore now known as lodestone or magnetite, and which probably gave us the term magnet.

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.

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