Atomic Number

 20

Atomic Mass

40.078 amu
                                                                                                                                                                                                                
 
Vital Information

Number of:
     Protons = 20
     Electrons = 20
     Neutrons = 20

Boiling Point = 1484.0 °C (1757.15 K, 2703.2 °F)
Melting Point = 839.0 °C (1112.15 K, 1542.2 °F)
Density @ 293K = 1.55 g/cm3
Electronegativity =  1.00 (Pauling scale)


 

This is Calcium in it's original form.
 
History and uses: Though lime was prepared by the Romans in the first century under the name calx, the metal was not discovered until 1808. After learning that Berzelius and Pontin prepared calcium amalgam by electrolyzing.


 

Milk is a common source of Calcium!

Without it's proper source of Calcium, the aardvark's skeleton would fail it, and causing this beautiful creature, to slowly disappear from this Earth.

 

Other uses for calcium can be:

• reducing agent for the preperation of metals such a thorium, uranium, zirconium, etc.
•deoxidiser, desulphurizer, or decarconizer for various alloys
•alloys of calcium with agent for aluminium, beryllium, copper, lead, and magnesium have some useful properties
•"getter" for residual gases in vacuum tubes, etc.
•quicklime is made by heating limestone and changes into slaked lime on the addition of water. It is a cheap base for the chemical industry with many uses.
•calcium from limestone is a component of Portland cement. Mixed with sand it hardens as mortar and plaster while taking up carbon dioxide from the air.

References: http://www.chemicalelements.com/elements/ca.html

                       http://www.eatright.org/Public/NutritionInformation/index_2990.cfm