atomic number 20
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| Noun | 1. |  atomic number 20 - a 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 animalsmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. fluor, fluorite, fluorspar - a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine gypsum - a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) burnt lime, calcined lime, calcium oxide, calx, fluxing lime, quicklime, unslaked lime, lime - a white crystalline oxide used in the production of calcium hydroxide limestone - a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals calcium ion, factor IV - ion of calcium; a factor in the clotting of blood |
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