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Magnesium

Chemical element
Magnesium is a chemical element; it has symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals it occurs naturally only in combination... Wikipedia
Symbol: Mg
Atomic mass: 24.305 u
Atomic number: 12
Electron configuration: Ne 3s2
Colors: silvery-white
Discovery: Joseph Black (1755)
Group: group 2 (alkaline earth metals)