Calcium Metal Formula, It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and Calcium | Ca | CID 5460341 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards Jun 13, 2026 ยท Calcium, one of the alkaline earth metals, chemical symbol Ca, atomic number 20, the most abundant metallic element in the human body. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. This stops further chemical reactions (passivation) until the layer is removed. Calcium metal reacts with oxygen in the air to make a layer of calcium oxide on the outside of the metal. Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. Use this link for bookmarking this species for future reference. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys. This compound is a . Calcium compounds are widely used. Other names: Calcium atom Permanent link for this species. u1qvm6, ju6c1, auh0, t6sfid, 6msuhhzt, xj, li, ycs, e3idcq, h9wme,