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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
in the manufacture of vacuum tubes to remove residual gases. the metal is of little commercial importance compared to its compounds, which are widely and diversely used. the element is a constituent of lime (see calcium oxide calcium oxide, chemical compound, cao, a colorless, cubic crystalline or white...
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