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Magnesium (pronounced /maegËniËziÉm/) mÃ¦gËniËziÉm is a chemical element with the Symbol, mg atomic number, 12 atomic weight.24 3050 and common oxidation +number. 2
Magnesium is a silver white metal and the eighth abundant element in the universe by mass. Constitutes about 1,92% of the earthâs crust (magnesium oxide) and is also found in seawater (magnesium salt).Magnesium is the 12 th element on the Periodic Table, the lightest among the metals for structural application.onstitutes about 1,92% of the earthâs crust (magnesium oxide) and is also found in seawater (magnesium salt). Magnesium is the 12 th element on the Periodic Table, the lightest among the metals for structural application.