Manganese is a chemical element with the symbol Mn and atomic number 25. It is a transition metal commonly used in alloys and as a catalyst.
Transition Metal: Elements located in d-block of the periodic table which have partially filled d orbitals.
A mixture composed of two or more elements, at least one being a metal, where metallic properties are enhanced compared to individual elements.
A substance that increases the rate of a chemical reaction without being consumed itself.