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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: compounds information. This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of calcium.For each compound, a formal oxidation number for calcium is given, but the usefulness of this number is limited for p-block elements in particular.he term hydride is used in a generic sense to indicate compounds of the type M x H y and not necessarily to indicate that any compounds listed behave chemically as hydrides. In compounds of calcium (where known), the most common oxidation numbers of calcium are: 2.