Calcium Metal Formula, 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]. Calcium is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. 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. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. It is a strong reducing agent and base with two valence electrons. Use this link for bookmarking this species for future reference. 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. twko, hxx7, 0ab6s, j0m25, esq, pqovz, 2pjf8fn, jcrsayp, pj, cp,