atomic number 20

Definitions of atomic number 20

1. noun

   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

   types:

   calcium ion, factor IV

   ion of calcium; a factor in the clotting of blood

   type of:

   metal, metallic element

   any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.