atomic number 11

Noun atomic number 11 has 1 sense

• atomic number 11(n = noun.substance) na, sodium - 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);
is a kind of metal, metallic element