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atomic number 20 > noun, substance
MeaningA white metallic element that burns with a brilliant light. The fifth most abundant element in the earth's crust. An important component of most plants and animals.
Synonymscalcium, Ca
Substance offluorite, fluorspar, fluor; gypsum; calcium oxide, quicklime, lime, calx, calcined lime, fluxing lime, unslaked lime, burnt lime; limestone
Broadermetallic element, metal
Narrowercalcium ion, factor IV

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