Definition: Metall (metall) is a chemical element with atomic number 27, and it has the symbol M and the periodic number 18. This metal can be found in many materials such as steel and aluminum alloys, among others. The word "metall" is derived from the Latin term "materia", meaning substance or material. It also refers to the process of transforming a compound into a pure state (metamorphosis), which often involves removing atoms or molecules in order to form new compounds.