Manganese: the essentials
Manganese metal is gray-white, resembling iron, but is harder and very brittle. The metal is reactive chemically, and decomposes cold water slowly. Manganese is widely distributed throughout the animal kingdom. It is an important trace element and may be essential for utilisation of vitamin B. Manganese is present in quantity the floor of oceans. It is an important component of steel.
Image adapted with permission from Prof James Marshall's (U. North Texas, USA) Walking Tour of the elements CD.
Cartoon by Nick D Kim ([Science and Ink], used by permission).
Manganese: historical information
Manganese metal was isolated by Gahn in 1774. He reduced the dioxide (MnO2, as the mineral pyrolusite) with charcoal (essentially carbon) by heating and the result was a sample of the metal manganese.
Manganese around us Read more »
Manganese compounds are essential to life. They are essential for the action of some enzymes. Soil deficiencies lead to infertility in mammals and to bone malformation in growing chicks.
Manganese is not found as the free metal in nature, however manganese minerals consisting of oxides, silicates, and carbonates are the common. Most Manganese is obtained from ores in Australia, Brazil, Gabon, India, Russia, and South Africa. Manganese nodules on ocean floors holds contain about 24% manganese.
|Location||ppb by weight||ppb by atoms||Links|
|Human||200 ppb by weight||23 atoms relative to C = 1000000|
Physical properties Read more »
Heat properties Read more »
- Melting point: 1519 [1246 °C (2275 °F)] K
- Boiling point: 2334 [2061 °C (3742 °F)] K
- Enthalpy of fusion: |203| kJ mol-1
Crystal structure Read more »
The solid state structure of manganese is: cubic.
Manganese: orbital properties Read more »
Manganese atoms have 25 electrons and the shell structure is 18.104.22.168. The ground state electronic configuration of neutral Manganese is [Ar].3d5.4s2 and the term symbol of Manganese is 6S5/2.
- Pauling electronegativity: 1.55 (Pauling units)
- First ionisation energy: 717.3 kJ mol‑1
- Second ionisation energy: 1509.0 kJ mol‑1
Isolation: it is not normally necessary to make manganese in the laboratory as it is available commercially. Nearly all manganese produced commercially is used in the steel industry as ferromanganese. This made by the reduction of iron oxide, Fe2O3, and managanese dioxide, MnO2, in appropriate proportions with carbon (as coke) in a blast furnace. Pure manganese is available through the electrolysis of manganese sulphate, MnSO4,
Manganese isotopes Read more »