Transition metal, atomic number 25.
Manganese is a chemical element with symbol Mn and atomic number 25. It is not found as a free element in nature; it is often found in combination with iron, and in many minerals. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.
Symbol Mn. Atomic mass 54.9380443 u. Group 7, period 4. Electron configuration [Ar] 3d5 4s2. Electrons per shell 2, 8, 13, 2. State at room temperature: Solid. Melting point 1245.8 °C, boiling point 2060.8 °C. Discovered by Torbern Olof Bergman.
Element data from Wikipedia, CC BY-SA 3.0.