Name: magnesium

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Name magnesium Symbol Mg Atomic number 12
Atomic weight 24.3050 (6) CAS Registry ID
7439-95-4
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Properties
Magnesium is the eighth most abundant
element in the earth's crust although not found
in it's elemental form. It is a Group 2 element
(Group IIA in older labelling schemes). Group 2
elements are called alkaline earth metals.
Magnesium tarnishes slightly in air, and
finely divided magnesium readily ignites upon
heating in air and burns with a dazzling white
flame. Normally magnesium is coated with a layer
of oxide, MgO, that protects magnesium from air
and water.
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Compounds Organic magnesium is important in both
plant and animal life. Chlorophylls are
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3.
magnesium-centered perphyrins. The adult daily
nutritional requirement, which is affected by
various factors include weight and size, is about
300 mg/day.
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History
Discovered Recognised as an
element by Joseph Black of Edinburgh, UK in
1755 Isolated by Sir Humphry Davy in 1808 at
England.
Origin The element is named after
Magnesia, a district of Thessaly in Greece,
where it was first found.
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The ore---Magnesite
Comments Magnesite crystal
group.The crystals have rhombic habit. The
largest on this specimen is 3.7 cm across.
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USAGE
It is now used in alloys to provide lightweight
frames for bicycles, car seats and luggage.
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