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°c;; sp. gr. at °c;; valence . calcium is a malleable, ductile, silver-white, relatively soft metal with face-centered, cubic crystalline structure. chemically it resembles strontium and barium; it is classed with them as an alkaline-earth metal alkaline-earth metals, metals constituting group
hydroxide. it combines with other elements, e.g., with oxygen, carbon, hydrogen, chlorine, fluorine, arsenic, phosphorus, and sulfur, forming many compounds. although lime (calcium oxide) has been known since ancient times, elemental calcium was first isolated by sir humphry davy in . today, calcium metal...
https://encyclopedia2.thefreedictionary.com/calcium