Calcium

Calcium is a silvery white metal which is obtained by the electrolysis of molten calcium chloride. Calcium compounds have many applications; for example, calcium chloride is used extensively to dry gases as it is capable of absorbing moisture from the atmosphere. Calcium oxide (lime), produced by heating limestone, has many applications including the chemical, agricultural, construction and water industries. Calcium is an essential constituent of the human body which contains, on average, 1kg. of the element.


Symbol
Ca

Discovered
1808 by Sir Humphrey Davy in London.

Abundance
One of the most abundant metal elements on Earth (41000 ppm), but it never occurs as the pure element, the main deposits being limestone (CaCO3 ), Dolomite (CaCO3 .MgCO3 ) and Gypsum (CaSO4 .2H2O).

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Atomic number 20 Clip
Atomic / Molecular Weight 40.078 gmol-1Clip
Density 1530 kgm-3Clip
Lattice constant 559 fmClip
Melting Point 1113 KClip
Boiling Point 1763 KClip
Tensile strength 42e6 to 60e6 Nm-2Clip
Specific heat capacity 653 Jkg-1K-1Clip
Bulk Modulus of Rigidity 17200000000 Nm-2Clip
Electromotive Series 2.87 VClip
Electrical Conductivity 29800000 Sm-1Clip
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See also: Calcium Magnesium Acetate, Periodic Table.

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Subjects: Chemistry