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manganese.

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GPT 3.5
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a transition metal that is found in abundance in the Earth's crust. Manganese has a grayish-white appearance and is solid at room temperature.

Various manganese compounds are used in a wide range of applications. One of the most common uses of manganese is in the production of steel. Manganese is added to iron to improve its strength, hardness, and resistance to corrosion. It is also used in the production of aluminum alloys and as a component in various types of batteries, such as rechargeable lithium-ion batteries.

In biological systems, manganese plays a crucial role as an essential trace element. It is an important cofactor in many enzymes, including those involved in the metabolism of carbohydrates, amino acids, and cholesterol. Manganese is also involved in the formation and maintenance of healthy bones, cartilage, and connective tissues.

Excessive exposure to manganese, particularly through inhalation of manganese dust or fumes, can be toxic to humans. It can lead to a condition called manganism, which is characterized by neurological symptoms similar to Parkinson's disease.

Overall, manganese has various industrial and biological applications and is an important element for the functioning of both living organisms and technological processes.

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