Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (Group 2, or alkaline earth metals) of the periodic table: all Group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure.
Magnesium is a crucial element in the human body and is involved in over 300 biochemical reactions. It is also used in various industrial applications, such as in the manufacturing of lightweight alloys for use in aircraft, missiles, and rockets. Additionally, magnesium compounds are used medicinally as common laxatives, antacids (e.g. milk of magnesia), and in a number of situations as an anticonvulsant, such as for the treatment of eclampsia.
By understanding the properties and uses of magnesium, you can appreciate its significance in both the natural world and in various human applications.