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Calcium is a chemical element, atomic number 20, that is an alkaline earth metal and occurs naturally as carbonate in limestone and as silicate in many rocks. Calcium is essential for living organisms, particularly in cell physiology, where movement of the calcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes. As a major material used in mineralization of bones and shells, calcium is the most abundant metal by mass in many animals.


Atomic number:   20
Symbol:   Ca
Atomic weight:   40.08
Boiling Point (C):   1440
Melting Point (C):   838
Density:   1.55
heatVapor:   36.74
heatFusion:   2.1
Electrical Conductivity:   .218
Thermal Conductivity:   .3
Specific Heat Capacity:   .149


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