Manganese
Definition and meaning of Manganese in chemistry.
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal that is often found in minerals in combination with iron.
In more detail
Situated in group 7 of the periodic table, manganese is a transition metal with a highly diverse chemical profile, capable of existing in multiple oxidation states ranging from -3 to +7. The most common and stable oxidation states are +2, +3, +4, +6, and +7, with the permanganate ion (MnO4 -) being a well-known strong oxidizing agent. Manganese is the twelfth most abundant element in the Earth's crust and is primarily mined from pyrolusite and rhodochrosite ores. The metal tarnishes slowly in air and oxidizes rapidly when heated, forming manganese dioxide. In biological systems, manganese is an essential trace nutrient, functioning as a critical cofactor for numerous enzymes, including manganese superoxide dismutase, which protects cells from oxidative stress. Despite its biological importance, chronic occupational exposure to high levels of airborne manganese particulates can lead to a severe neurological condition known as manganism, which closely resembles Parkinson's disease.
Key facts
| Field | General Chemistry |
|---|---|
| Symbol | Mn |
| Atomic number | 25 |
| Atomic mass | 54.938 u |
| Category | Transition Metal |
| State at room temperature | Solid |
| Melting point | 1246 °C |
| Boiling point | 2061 °C |
| Year discovered | 1774 |
Manganese dioxide is widely used as a depolarizer in standard dry-cell alkaline batteries to prevent the accumulation of hydrogen gas during discharge.
Frequently asked questions
Why is manganese important for steel production?
Manganese is essential in steelmaking because it acts as a deoxidizer and desulfurizer, removing impurities and improving the workability and strength of the final alloy.
What are the biological roles of manganese?
Manganese serves as a vital cofactor for many enzymes involved in metabolism, bone formation, and antioxidant defense mechanisms within biological organisms.