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Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth 's crust. The ion Ca 2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.Free calcium metal is too reactive to occur in nature.n chemical terms, calcium is reactive and soft for a metal; though harder than lead, it can be cut with a knife with difficulty. It is a silvery metallic element that must be extracted by electrolysis from a fused salt like calcium chloride.
Calcium chelate has higher absorption levels than inorganic salts, such as calcium carbonate, and is retained longer in the body. CALCIUM CITRATE: highly soluble, this type of calcium is formed by binding calcium and citric acid (a form of vitamin C).It is easily absorbed, assimilated and utilized in the body with the dual benefit of usable calcium and vitamin C.alcium chelate has higher absorption levels than inorganic salts, such as calcium carbonate, and is retained longer in the body. CALCIUM CITRATE: highly soluble, this type of calcium is formed by binding calcium and citric acid (a form of vitamin C).