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burns with a bright yellow-red flame when heated, mainly forming the nitride. it reacts directly with water, forming the 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
of other metals, such as thorium and uranium, by reduction; and (like barium) 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...
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