Key information
Atomic number: 
25
Atomic weight: 
54.94
Density: 
7430 kg/m³
Boiling point: 
2423.16° K
Melting point: 
1518.16° K
Heat vapour: 
224.87 kJ/mol
Heat fusion: 
14.66 kJ/mol
Thermal conductivity: 
5.4 W/m/K

Manganese is a grey white metal, which is added to steel, to improve its rolling and forging qualities, strength, toughness, stiffness, wear resistance, hardness, and hardenability. It has a resemblance to iron although the element is non-magnetic. It is used to form highly ferromagnetic alloys.

Manganese dioxide oxidises concentrated hydrochloric acid to produce chlorine

4HCl (hydrochloric acid) + MnO2 (manganese dioxide) -> MnCl2 + Cl2 (chlorine gas) + 2H2O (water)

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages