Mg is the chemical symbol for magnesium, an alkaline earth metal with atomic number 12. It is commonly used in alloys, fireworks, and as a dietary supplement.
Related terms
Alkaline Earth Metals: Group 2 elements on the periodic table that have two valence electrons and relatively low reactivity.
Atomic Number: The number representing each unique element on the periodic table, corresponding to the number of protons in an atom's nucleus.