Manganese. Number 25. Mn. Atomic weight: 54.938.
Electron Configuration
Melting Point
Boiling Point
Density
Color
Physical State at Room Temperature
Common Charges for Ions
Reactions
Common Compounds
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[Ar] 4s2 3d5
1250 °C
2060 °C
7470 kg m^-3
Gray-white/silver metallic
Solid
Mn2+, Mn3+, Mn4+, Mn6+
When divided, Mn metal will burn in air to form Mn3O4 and Mn3N2, does not react with water, burns in chlorine, and reacts with bromine, iodine, and flourine, dissolves
Manganese difluoride, Manganese trifluoride, Manganese dichloride, Manganese trichloride, Manganese dibromide, Manganese diiodide, Manganese oxide, Manganese dioxide, Trimanganese tetroxide, Manganese sulphide, Manganese disulphide
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Discovery: Manganese was discovered by Johan Gottlieb Gahn, a Swedish chemist, in 1774. It is found naturally in the earth as well as in animals, plants, or humans, though it is never found pure and is always combined with ores. It can also be found in crustal rocks or on meteorites. Its name comes from the latin word "magnes" meaning magnet, though manganese is only paramagnetic.
Uses: Manganese has been used to make colorless glass for over 2000 years. It is also used in plants for photosynthesis and for using vitamin B1. It is also used with aluminum and antimony to make ferromagetic alloys, as being paramagnetic means that it is able to be magnetic only after treatment.
Hazards: An excess of manganese or manganese dust is harmful, exposure to manganese dust can cause manganism, which has symptoms similar to Parkinson's disease. Manganese metal powder is a fire hazard.
Uses: Manganese has been used to make colorless glass for over 2000 years. It is also used in plants for photosynthesis and for using vitamin B1. It is also used with aluminum and antimony to make ferromagetic alloys, as being paramagnetic means that it is able to be magnetic only after treatment.
Hazards: An excess of manganese or manganese dust is harmful, exposure to manganese dust can cause manganism, which has symptoms similar to Parkinson's disease. Manganese metal powder is a fire hazard.