Basic information

  • Symbol: Mg
  • Atomic number: 12
  • Atomic weight: 24.3050
  • Group: 2
  • Period: 3
  • Color: Silvery white
  • Classification: Metallic


  • Magnesium is the 8th most abundant element in earth's crust even though not found in it's elemental form.
  • Normally magnesium is coated with a layer of oxide, MgO, that protects magnesium from air and water.
  • Sea water also contains plenty of magnesium.
  • Magnesium: heating in air and burns with a dazzling white flame.


It is important for plant and animal life.


Magnesium is a grayish-white, fairly tough metal.

Biology (in humans)

The adult human daily requirement of Magnesium is about 0.3 g day-1

Geology (in the universe)

Chlorophylls porphyrins based upon Magnesium


12 electrons, shell structure is 2.8.2

Interesting Facts

Magnesium was discovered by Sir Humphrey Davy in 1755 in England.


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