Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a reactive metal, and is the eighth most abundant element in the Earth’s crust. Magnesium is a very important element for life, as it is involved in many biological processes, including muscle and nerve function, and is also found in many minerals, especially those that are involved in the formation of bones. Magnesium is also a lightweight and strong metal, which makes it useful for applications in many different industries, such as the aerospace industry, automotive industry, electronic devices, and in construction materials. Magnesium alloys are commonly used in the aerospace industry due to their high strength-to-weight ratio, which makes them useful in the construction of aircraft and spacecraft.