A Calcium Reaction involves a process in which Calcium is mixed with another substance which react to form something else.

What are the origins of the word Calcium ?
Originates from the latin word 'calcis' meaning lime.

Facts about the Classification of the Element Calcium
Calcium is classified as an "Alkaline Earth Metals" which are located in Group 2 elements of the Periodic Table. An Element classified as an Alkaline Earth Metals are found in the Earth’s crust, but not in the elemental form as they are so reactive. Instead, they are widely distributed in rock structures.

Brief Facts about the Discovery and History of the Element Calcium
Calcium was discovered by Sir Humphrey Davy in 1808

Occurrence of the element Calcium in the Atmosphere
3.5% of Earth's crust
Fifth most abundant element in the earth's crust
Obtained from chalk, limestone and marble
Only found in living organisms

Common Uses of Calcium
Dairy products are an excellent source of calcium. Deficiency can affect bone and teeth formation
Vitamin D is needed to absorb calcium
Reducing agent
Alloying agent used in the production of alloys
Coral calcium , calcium carbonate, chloride, citrate, carbide, hydroxide

The Properties of the Element Calcium
Name of Element : Calcium
Symbol of Element : Ca
Atomic Number of Calcium : 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C - 1112.15 °K
Boiling Point: 1484.0 °C - 1757.15 °K
Number of Protons/Electrons in Calcium : 20
Number of Neutrons in Calcium : 20
Crystal Structure: Cubic
Density @ 293 K: 1.55 g/cm3
Color of Calcium : silvery