Meaning of ATOMIC NUMBER 20

WordNet Dictionary
	Definition:		[n]  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 animals
	Synonyms:		Ca, calcium
	See Also:		burnt lime, calcined lime, calcium ion, calcium oxide, calx, factor IV, fluor, fluorite, fluorspar, fluxing lime, gypsum, lime, limestone, metal, metallic element, quicklime, unslaked lime