Magnesium has 12 neutrons. An alkaline earth metal, magnesium also has 12 electrons and 12 protons. Its chemical symbol is Mg, and it has an atomic number of 12.
Sir Humphrey Davy discovered magnesium in 1808. It does not occur freely in nature but can be obtained from a mineral, such as dolomite or seawater.
Magnesium has three stable isotopes. Grayish-white in color and a lightweight metal, magnesium is very flammable. It can react with different substances and elements, such as water, halogens, acids and bases.
There are different uses for magnesium, including as an alloy for structural metals in automobiles and airplanes. It is also used in flares and rockets.