Magnesium is a chemical element with 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.

Atomic Weight: 24.305
Density:       1.738 g/cm3
Melting Point: 650 °C
Boiling Point: 1090 °C