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Chemical Elements

Manganese

franklinite, pyrolusite, Manganese metal, psilomelane, transition elements

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Manganese, symbol Mn, silvery white, brittle metallic element used principally in making alloys. Manganese is one of the transition elements of the periodic table. The atomic number of manganese is 25.

Properties and Occurence

Manganese was first isolated in 1774 by the Swedish chemist Johan Gottlieb Gahn. Manganese metal corrodes in moist air and dissolves in acid. The element melts at 1245°C (2271°F), boils at 2061°C (3742°F), and has a specific gravity of 7.4. Its atomic weight is 54.938.

Manganese does not occur in the free state, except in meteors, but is widely distributed over the world in the form of ores, such as pyrolusite, rhodochrosite, franklinite, psilomelane, and manganite. The principal ore is pyrolusite. The element’s name comes from the Latin word magnes, “magnet” and was chosen because pyrolusite is magnetic. Manganese ranks about 12th in abundance among elements in Earth's crust. Ukraine, Georgia, and South Africa are important producers of manganese.



Article key phrases:

franklinite, pyrolusite, Manganese metal, psilomelane, transition elements, rhodochrosite, Occurence, atomic weight, periodic table, meteors, specific gravity, moist air, dissolves, crust, abundance, magnet, acid, Ukraine, Earth, elements, Georgia, free state, South Africa, Properties

 
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