A soft silvery metallic element with the symbol Na and atomic number 11, occurs principally as table salt (sodium chloride) and as the minerals amphibole, cryolite, halite, zeolite.
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)
