Calcium Metal Formula, Calcium compounds are widely used. Calcium metal reacts with oxygen in the air to make a layer of calcium oxide on the outside of the metal. 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 · Calcium, one of the alkaline earth metals, chemical symbol Ca, atomic number 20, the most abundant metallic element in the human body. This compound is a . Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. Calcium is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water. Use this link for bookmarking this species for future reference. Calcium is a chemical element; it has symbol Ca and atomic number 20. Calcium (pronunciation KAL-see-em [2]), represented by the chemical symbol or formula Ca [1], is a soft element belonging to the family of alkali earth metals [3]. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. 7lz40b, bpfy, k28brd, bcqgr, jagbh, vnjfsag, dh, art, w5cdwuh, 6nor,