atomic number 11


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Related to atomic number 11: atomic number 16
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Noun1.atomic number 11 - a silvery soft waxy metallic element of the alkali metal groupatomic number 11 - a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
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.
halite, rock salt - naturally occurring crystalline sodium chloride
brine, saltwater, seawater - water containing salts; "the water in the ocean is all saltwater"